This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. Control force readings may be terminated when vehicle speed falls to 5 mph. S7.11 Service brake system - first fade and recovery test. %%EOF The shoe and lining assembly consists of a steel backing with attached lining material. S6.10.2 For vehicles with a GVWR greater than 10,000 pounds, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 20 mph, any wheel on a nonsteerable axle other than the two rearmost nonliftable, nonsteerable axles may lock up for any duration. 3) Here are the types of tests that must be conducted on a typical air brake system: a) The Governor Cut in/Cut out test is to make sure that the governor is applying or cutting off air pressure to the air reservoir tanks as needed. Accelerate immediately to the initial test speed after each stop. They feel sooooo much more confident in a heavy vehicle. You are using an unsupported browser. Stability and control during braking (braking-in-a-curve test), 8. S5.4.1 Master cylinder reservoirs. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM S7.7.1.5 Following observation of the vehicle in a stationary condition for the specified time in one direction, repeat the same test procedure with the vehicle orientation in the opposite direction on the specified grade. Maintain control force until vehicle has stopped. (c) Of a color that contrasts with its background, if it is not engraved or embossed. S6.11 Thermocouples. here. Here in Ontario it is all over the map. For S7.3, S7.5, S7.8, S7.15, S7.17, S7.11.1.2, S7.11.2.2, S7.11.3.2, and as required for S7.13, the transmission selector control is in neutral for all decelerations. 0000002585 00000 n Theyll do this by turning the key to the on position and then checking to see if the engine turns over. In many disc brake configurations, a warning system employs a control module that monitors the hydraulic brake electrical system. This is an automated process for Some have air brakes but most operators have hydraulic.One of the reasons they use against air brakes is because there is such a turn over of drivers they don't want to provide the extra training. Heres how to do a basic check: Start by checking the fluid level in the reservoir. Air very much does apply the service brake. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? Make five stops from 30 mph at 10 fpsps for each stop. 3. Disconnect the primary source of power of one subsystem. Need to Pass your CDL School Bus Endorsement Test! (b) For EVs with RBS that is part of the service brake system, the tests in S7.10.1 or S7.10.2 are conducted with the RBS discontinued and all other systems intact. S6.2.3 At the beginning of each performance test in the test sequence (S7,3, S7.5, S7.7 through S7.11, and S7.13 through S7.19 of this standard), unless otherwise specified, each propulsion battery of an EV is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. (c) Unlimited wheel lockup is allowed during spike stops (but not spike check stops), partial failure stops, and inoperative brake power or power assist unit stops. 5 - 10 S7.7.1.3 With the vehicle held stationary by means of the service brake control, apply the parking brake by a single application of the force specified in (a), (b), or (c) of this paragraph, except that a series of applications to achieve the specified force may be made in the case of a parking brake system design that does not allow the application of the specified force in a single application: (a) In the case of a passenger car or other vehicle with a GVWR of 10,000 lbs. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. Fill to this level. My bus with air drum brakes all around feels like it can stop in half the distance of the hydraulic brakes. Repeat the test, impacting the vehicle from the rear. (For vehicles only having to meet the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 in section S5.1, the applicable test procedures and sequence are S7.1, S7.2, S7.4, S7.5(b), S7.5(a), S7.8, S7.9, S7.10, and S7.18. If the speed attainable in 2 miles is not less than 99 mph, a passenger car shall, in addition, be capable of stopping from the applicable speed indicated below, within the corresponding distance specified in column I of table II. S5.1.3.1 The service brakes on a vehicle equipped with one or more brake power assist units or brake power units, with one such unit inoperative and depleted of all reserve capability, shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. will bring you to those results. Can I Bring My Own Oil And Filter to Valvoline, How Do I Reset My Central Locking On My Car, How Do I Get Dried Paint Off My Car Interior, Park your vehicle on a level surface and set the emergency brake, Place a large pan or catch basin underneath the hydraulic brake line where it connects to the wheel cylinder or caliper, Have an assistant slowly depress the brake pedal while you watch for any dripping fluid from the connection point, If there is no sign of leaking, have your assistant pump the brakes several times before holding down firmly on the pedal to check for leaks again, Repeat steps 3 and 4 at each connection point until you are satisfied that there are no leaks in the system. S7.9.1 With the vehicle at lightly loaded vehicle weight or at the manufacturer's option for a vehicle with a GVWR greater than 10,000 pounds, at lightly loaded vehicle weight plus not more than an additional 1,000 pounds for a roll bar structure on the vehicle, alter the service brake system to produce any one rupture or leakage type of failure, other than a structural failure of a housing that is common to two or more subsystems. To pass, applicants must answer 40 questions correctly. When stopped four consecutive times under the conditions specified in S6, each vehicle with a GVWR greater than 10,000 pounds manufactured on or after July 1, 2005 and each vehicle with a GVWR greater than 10,000 pounds manufactured in two or more stages on or after July 1, 2006 shall stop from 30 mph or 75 percent of the maximum drive-through speed, whichever is less, at least three times within the 12-foot lane, without any part of the vehicle leaving the roadway. Hydraulic Brake Fluids: Standard regulation on hydraulic brake fluids. When you are towing a trailer, the more weight that is on the trailer, the harder you will need to pull down on the lever to activate the brakes. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. See Fig. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. There's nothing more important on any school bus than the braking system. Have you ever wondered why trucks and buses make those funny squeaking and hissing sounds? Next, check the brake hoses for any leaks or damage. 0000000954 00000 n The service brakes on a vehicle equipped with one or more brake power assist units, with one such unit inoperative, shall be capable of stopping a vehicle from 60 mph: (a) In six consecutive stops at an average deceleration for each stop that is not lower than that specified in column I of table III, when the inoperative unit is not initially depleted of all reserve capability; and. Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. 0000000859 00000 n This will tell you how much force the system is capable of generating. The CamLaster brake has 2 key design differences over traditional S-cam brakes. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. Except as noted in S5.1.1.2 and S5.1.1.4, if a vehicle is incapable of attaining a speed specified in S5.1.1, S5.1.2, S5.1.3, or S5.1.6, its service brakes must be capable of stopping the vehicle from the multiple of 5 mph that is 4 to 8 mph less than the speed attainable in 2 miles, within distances that do not exceed the corresponding distances specified in Table II. Also they use the excuse that if they train the drivers on air brakes then the drivers will just go to another employeer that pays more i.e. If your vehicle has hydraulic brakes, its important to check them regularly to ensure they are in good working order. (b) (For vehicles with brake power units with accumulator type systems.) Choosing an item from If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. (This test need not be run if the option in S7.10.2 is selected.) Regenerative braking system or RBS means an electrical energy system that is installed in an EV for recovering or dissipating kinetic energy, and which uses the propulsion motor(s) as a retarder for partial braking of the EV while returning electrical energy to the propulsion batteries or dissipating electrical energy. Once youve released the pedal, check for any leaks around fittings or connections. Open the window and listen for the air leaks. (when the temperature of components on both ends of an axle are averaged). Again, hold your foot on the pedal for a few seconds before releasing it. An auxiliary means may be used to accelerate an EV to test speed. Inoperative brake power and power assist units. S7.11.1.2 Vehicles with GVWR greater than 10,000 pounds. Effectively, the engine works backwards by creating negative torque. S7.13 Service brake system - second fade and recovery test. S7.16 Service brake system - water recovery test. (c) The service brakes shall be capable of stopping each vehicle with a GVWR greater than 10,000 pounds in two effectiveness tests within the distances and from the speeds specified in S5.1.1.2 and S5.1.1.3. Bus should not move. Place bus in Neutral and set parking brake. The GA CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%).The CDL general knowledge test is required to be taken by all CDL applicants. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. S5.1 Service brake systems. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. For vehicles with parking brake systems not utilizing the service brake friction elements, burnish the friction elements of such systems prior to parking brake tests according to the manufacturer's published recommendations as furnished to the purchaser. If You are Doing a Pre-Trip on the Side of a Street, You Should: Which Three Test Would You Perform on a Hydraulic System? S7.9.4 (For vehicles with antilock and/or variable proportioning brake systems.) In Florida, anything that has an Air Brake option is so equipped. 1 CFR 1.1 When testing a hydraulic brake booster, there are several things you need to take into account. multiple choice questions that will test your understanding of terminology. Drivers 6 0 obj<> endobj The pedal should not move. All vehicle openings (doors, windows, hood, trunk, convertible top, cargo doors, etc.) S7.1 Brake warming. (2) Except for a separate indicator lamp for an anti-lock system, a regenerative system, or an indicator for both anti-lock and regenerative system, the letters and background of each separate indicator lamp shall be of contrasting colors, one of which is red. 3. Search & Navigation Step on the service brake to make sure the bus doesn't pull to either side. Engineer: Frederick Smith. Indirectly Controlled Wheel means a wheel at which the degree of rotational wheel slip is not sensed, but at which the modulator of an antilock braking system adjusts its brake actuating forces in response to signals from one or more sensed wheels. 39.00 Hydraulic Brakes 2. @WXhP|kk=_BW. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. Use only heavy-duty brake fluid, DOT 3. One way to test for leaks is to press the brake pedal and hold it down for a few seconds. 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.95. The first step is to ensure that the parking brake is completely disengaged. Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. However, the options provided in S5.3.1(a) shall not apply to a vehicle manufactured without a split service brake system; such a vehicle shall, to meet the requirements of S5.3.1(a), be equipped with a malfunction indicator that activates under the conditions specified in S5.3.1(a)(4). Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. The Federal Motor Carrier Safety Administration (FMCSA) has developed and issued standards for State testing and licensing of CDL holders. This will tell you how quickly fluid can move through the system. S5.1.3.3 Brake power units. To receive this license, applicants must pass a 50-question test. (b) The parking mechanism must be engaged before the ignition key can be removed. If you are stopped on a hill and your car begins to roll backwards, there are a few things you can do to prevent it from happening. 0000000778 00000 n Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. The interval from the start of one service brake application to the start of the next shall be either the time necessary to reduce the initial brake temperature to between 230 F. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight. If a battery is replaced rather than recharged, the replacement battery is to be charged and measured for state of charge in accordance with these procedures. S7.10 Service brake system - inoperative brake power unit or brake power assist unit test. Skid number means the frictional resistance of a pavement measured in accordance with ASTM E274-70 (incorporated by reference, see 571.5) at 40 mph, omitting water delivery as specified in paragraphs 7.1 and 7.2 of that method. Thats because when you turn the key to on position, it also activates the starter motor. 3. S6.1.2 For applicable tests specified in S7.5(a), S7.7, S7.8, and S7.9, vehicle weight is lightly loaded vehicle weight, with the added weight, except for the roll bar structure allowed for trucks and buses with a GVWR greater than 10,000 pounds, distributed in the front passenger seat area in passenger cars, multipurpose passenger vehicles, and trucks, and in the area adjacent to the driver's seat in buses. 0000004837 00000 n Test procedure and sequence. Restore system to normal at completion of this test. If no recommendations are furnished, run the vehicle in an unburnished condition. The force required for actuation of a hand-operated brake system shall be measured at the center of the hand grip area or at a distance of 112 inches from the end of the actuation lever, as illustrated in Figure II. Summary Modern four-wheel disc brake systems offer a combination of low maintenance, advanced materials and the benefits of electronic warning systems. The performance requirements of S5 shall be met under the following conditions. The indicator lamp shall be deactivated at the end of the check of lamp function unless there is a malfunction or a message about a malfunction that existed when the key switch was last turned to the off position. To check for leaks at specific points in the system, you can use a hand-held vacuum pump and gauge to check for pressure loss at each connection point. If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below. (b) If a single common indicator is used, the lamp shall display the word Brake. Burnish stops are conducted on any surface. Exhaust any residual brake power reserve capability of the disconnected system. Its a 34' Freightliner Thomas. Each brake power unit reservoir servicing only the brake system shall have a minimum capacity equivalent to the fluid displacement required to charge the system piston(s) or accumulator(s) to normal operating pressure plus the displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoir or accumulator(s) move from a new lining fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position. or less shall be capable of making 10 spike stops from 30 mph, followed by 6 effectiveness (check) stops from 60 mph, at least one of which shall be within a corresponding stopping distance specified in column I of table II. 17.00 Safety Equipment School bus that fails to meet April 1, 1977 federal school bus safety standards (no approved SED hardship waiver) A 10.02 Registration N/A 4. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. This web site is designed for the current versions of The disc brake refers to that portion of the brake system that's attached to the end of the axle. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. A dual air brake system is one in which there are two separate circuits, each with its own reservoir, compressor, and brakes. (With parking brake released.) Establish an initial brake temperature before the first brake application of 130 to 150 F. There are plenty of pros and cons about the systems. This content is from the eCFR and is authoritative but unofficial. This warning indicator shall, instead of meeting the requirements of S5.3.2 through S5.3.5, activate (while the vehicle remains capable of meeting the requirements of S5.1.2.2 and the ignition switch is in the on position) a continuous or intermittent audible signal and a flashing warning light, displaying the words STOP-BRAKE FAILURE in block capital letters not less than one-quarter of an inch in height. Backup system means a portion of a service brake system, such as a pump, that automatically supplies energy, in the event of a primary brake power source failure. Hydraulic Brake Check Pump the brake pedal three times, then hold it down for five seconds. S5.6 Brake system integrity. Except as provided in 5.2.2, the parking brake system on a passenger car and on a school bus with a GVWR of 10,000 pounds or less shall be capable of holding the vehicle stationary (to the limit of traction on the braked wheels) for 5 minutes in both a forward and reverse direction on a 30 percent grade. 6 b. (eg: Each passenger car and each multipurpose passenger vehicle, truck, and bus with a GVWR of 10,000 pounds or less must be capable of meeting the requirements of S5.1.1 through S5.1.6 under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. Splash Guards/Mud Flaps - mounted, not damaged . I'd hate to be stuck driving or riding in a bus when its hydraulic breaks crap out and fail to stop the bus. The official, published CFR, is updated annually and available below under Each school bus with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1 through S5.1.5, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. This will help you identify any areas where fluid may be leaking from the system. I'll tell you soon.. First, always put your safety first and be aware of your surroundings. The brake system that applies and releases the brakes when the driver uses the brake pedal is the: To make an emergency stop with air brakes, using the stab braking method, you should: Brake lag distance at 55 mph is _____ feet? Reservoirs, whether for master cylinders or other type systems, shall have a total minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position, as determined in accordance with S7.18(c) of this standard. If the brake power or brake power assist unit operates in conjunction with a backup system and the backup system is activated automatically in the event of a primary power failure, the backup system is operative during this test. Subscribe to: Changes in Title 49 :: Subtitle B :: Chapter V :: Part 571 :: Subpart B :: Section 571.105. S6.2 Electric vehicles and electric brakes. As part of a routine preventative maintenance program, school bus operators should regularly test their hydraulic brakes. Hydraulic Brakes have hydraulic hoses, tubing, valves, and con- Includes the hydraulic nections leaking, cracked, portion of vacuum actuated pinched, chafed, flat- and compressed-air-over tened, restricted, broken, Spike stop means a stop resulting from the application of 200 lbs of force on the service brake control in 0.08 s. Split service brake system means a brake system consisting of two or more subsystems actuated by a single control, designed so that a single failure in any subsystem (such as a leakage-type failure of a pressure component of a hydraulic subsystem except structural failure of a housing that is common to two or more subsystems, or an electrical failure in an electric subsystem) does not impair the operation of any other subsystem. I drove both busses one right after the other 6. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds) not more than 150 pounds for a foot-operated system, and not more than 125 pounds for a hand-operated system. Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. GMC C5500 Topkick A/C Compressor Clutch Parts. In extreme cases, a complete loss of braking power can occur. information or personal data. I'll show you my air brakes if you show me yours. Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. xref How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? or less, unloaded vehicle weight plus 400 lbs. This content is from the eCFR and may include recent changes applied to the CFR. CDL School Bus Endorsement S Practice Test -3. Move the bus forward at approximately 5 miles per hour. For Federal Register citations affecting 571.105, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov. S6.2.2 At the beginning of the first effectiveness test specified in S7.3, and at the beginning of each burnishing procedure, each EV's propulsion battery is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. On vehicles with brake power assist units, render the brake power assist unit inoperative, or one of the brake power assist unit subsystems if two or more subsystems are provided, by disconnecting the relevant power supply. Make three stops from 30 mph at 10 fpsps for each stop. The service brakes of a vehicle equipped with one or more brake power units with an accumulator-type reserve system, with any one failure in any one unit shall be capable of stopping the vehicle from 60 mph -, (a) In 10 consecutive stops at an average deceleration for each stop that is not lower than that specified in column II of table III, when the unit is not initially depleted of all reserve capability; and. If its low, top it off and bleed the brakes according to the manufacturers instructions. They are also less expensive on a new bus purchase, and many operations are in the mindset of buying cheap to save money up front. Step 7: Start Engine and Check Brake System Test for hydraulic leaks: If the vehicle has hydraulic brakes, pump the brake pedal three times. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. Stopping distance means the distance traveled by a vehicle from the point of application of force to the brake control to the point at which the vehicle reaches a full stop. Check the hydro-boost for leaks. I am all for air brakes. Again, watch for any pressure loss or fluctuations that could indicate a problem. However, a regular schedule for periodic inspection should be established based on the severity of operation, i.e., frequent stop and go driving in urban traffic. Leave an interval of 0.4 mi between the start of brake applications. S7.10.1 Regular procedure. If the vehicle is equipped with an adjustable engine speed governor, it is adjusted according to the manufacturer's recommendation. Bus did brake by itself, but Wabco diagnostics laptop showed that neither parking brake nor service brakes were activated, whereas obviously some brake was applied (And it was not engine brake). Each school bus with a GVWR greater than 10,000 pounds manufactured after January 12, 1996 and before March 1, 1999 and which is equipped with an antilock brake system may comply with paragraph S5.1.1.2 and S5.5.1 rather than the first effectiveness test, as specified in S5.1.1.1. Once you have confirmed that there are no leaks, you can proceed to pump the pedal harder and faster until you reach full pressure. S7.4.2.1 Burnish. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. (Dual wheels on one side of an axle are considered a single wheel.). Same issue happened. Choosing an item from This self-paced course gives you: more than 100 practice test questions with feedback; EASY step-by-step instructions how to conduct a pre-trip inspection on an air brake system; DETAILED rules to use air brakes and brake downhill with a large vehicle . For an EV that is equipped with both ABS and RBS that is part of the service brake system, the ABS must control the RBS. I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. 1200-1500 RPM. Then, for a vehicle with a GVWR of 10,000 pounds or less, make four stops from 80 mph if the speed attainable in 2 miles is not less than 84 mph. S6.2.5 For tests conducted in neutral, the operator of an EV with no neutral position (or other means such as a clutch for disconnecting the drive train from the propulsion motor(s)) does not apply any electromotive force to the propulsion motor(s). Went there for test drive with another tech and connected laptop. In determining the fully applied worn condition assume that the lining is worn to: (1) Rivet or bolt heads on riveted or bolted linings, or, (2) within one thirty-seconds of an inch of shoe or pad mounting surface on bonded linings, or. Enhanced content is provided to the user to provide additional context. S7.7 Parking brake test. Apply the brake pedal with approximately 100 lbs. Record the maximum control force for each stop. S7.4.1.1 Burnish. (b) Service brake system - second effectiveness test. The parking brake tests for any vehicle on different grades, in different directions, and for different loads may be conducted in any order. Air brakes are used on most large commercial vehicles and use compressed air to operate the brakes. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. After each snub, accelerate at maximum rate to 40 mph and maintain that speed until making the next brake application at a point 1.5 mi from the point of the previous brake application. Check the fluid level in the hydraulic brake reservoir. If the vehicle is equipped with a neutral gear that automatically disables the RBS, the test procedures which are designated to be conducted in gear may be conducted in neutral. switch to drafting.ecfr.gov. A. Stop the vehicle with the vehicle at its lightly loaded vehicle weight, or at the manufacturer's option, at its lightly loaded vehicle weight plus not more than an additional 1000 pounds for a roll bar structure on the vehicle. - School Bus Conversion Resources School Bus Conversion Resources > Skoolie Tech > Brake Systems and Air Brakes Hydraulic or Air Brakes? Get it fixed before driving. The wheels on the two rearmost nonliftable, nonsteerable axles may lock up according to (b). They last longer and are much more cost effective. S5.1.7 Stability and control during braking. This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Texas CDL exam. S1. S7.4.2.2 Brake adjustment - post burnish. This contact form is only for website help or website suggestions. Fig. DewinterizeYour RV: A Complete Checklist. S6.4 Transmission selector control. However, if the weight on any axle of a vehicle at lightly loaded vehicle weight exceeds the axle's proportional share of the gross vehicle weight rating, the load required to reach GVWR is placed so that the weight on that axle remains the same as a lightly loaded vehicle weight. Modern four-wheel disc brake configurations, a warning system employs a control module that monitors hydraulic... 0000002585 00000 n Theyll do this by turning the key to on position, also... And it needs to be stuck driving or riding in a bus its... Sure the bus doesn & # x27 ; t pull to either side the start of brake applications and compressed... Total stopping distance for air brakes over hydraulic brakes, hands down fpsps for each stop for a seconds... Brakes longer than that for hydraulic leaks in the hydraulic brakes, its important to check them regularly ensure... Provide additional context creating negative torque distance for air brakes longer than for. Distance for air brakes longer than that for hydraulic brakes, its important to check them to! Help or website suggestions to a stop, impacting the vehicle from the rear exam... Here in Ontario it is adjusted according to ( b ) ( for vehicles antilock. S7.10.2 is selected. ) key can be removed FMCSA ) has developed and issued standards for testing. Brakes if you show me yours many disc brake systems offer a combination of low maintenance advanced. Program, school bus operators should regularly test their hydraulic brakes are safer! Of low maintenance, advanced materials and the benefits of electronic warning systems. ) Fluids: Standard on!, watch for any pressure loss or fluctuations that could indicate a problem checking fluid... Be repaired before use always worked on juice ( hydraulic ) 4 wheel disk brakes for air. Times then hold it down for five seconds focus on 30 questions related to the user to provide context. Way to test speed after each stop if you show me yours to 5 hydraulic brake test on school bus brakes if you show yours... The on position, it is adjusted according to the brakes while coming to a.. Or less, unloaded vehicle weight plus 400 lbs a leak in the brake hoses any! Means may be steady burning or flashing fluctuations that could indicate a problem activates the starter Motor this! Any pressure loss or fluctuations that could indicate a problem will focus on 30 questions related to initial. Press the brake pedal and hold it down for a few seconds releasing... To stop the bus forward at approximately 5 miles per hour a vehicle equipped with electrically-actuated Service brakes performs... Which of the disconnected system be met under the following makes the total stopping distance air! Is from the eCFR and may include recent changes applied to the air leaks vehicle... A leak in the brake pedal and hold it down for a few seconds before releasing it releasing.! Must answer 40 questions correctly check: start by checking the fluid level in brake!, start the engine and let it idle for a few minutes warm! All around feels like it can stop in half the distance of the disconnected system practice test focus! Motor Carrier Safety Administration ( FMCSA ) has developed and issued standards for testing! And use compressed air to operate the brakes a lot of stopping power a hydraulic brake check pump the pedal... Complete loss of braking power can occur run if the vehicle is equipped with an adjustable engine governor! Position and then checking to see if the engine works backwards by creating negative torque an. That use fluid pressure to transfer force from the eCFR and is authoritative but unofficial accumulator type systems ). Must answer 40 questions correctly performance requirements of S5.2.1 and S5.2.3 to them! 30111, 30115, 30117, and 30166 ; delegation of authority at 49 CFR 1.95 single-piston. It is not engraved or embossed them regularly to ensure that the parking brake is completely disengaged use... Repaired before use that use fluid pressure to transfer force from the and... Leaks around fittings or connections than hydraulic brakes, its important to check regularly. Indicates that there is a leak in the system and it needs to be before. Iii - inoperative brake power units with accumulator type systems. ) can be removed pass applicants. Control force readings may be terminated when vehicle speed falls to 5 mph you turn the key to on,. Key to the CFR brakes longer than that for hydraulic leaks in the system S7.11.3.1! Effective than hydraulic brakes burning or flashing let it idle for a few seconds before releasing.. Use compressed air to operate the brakes the benefits of electronic warning systems..... Pull to either side far safer, and immediately follow the recovery procedure specified in S7.11.3.1 these tests... Test their hydraulic brakes up, slowly depress the foot pedal until feel... Tests from a speed of 100 kph or the maximum vehicle speed, whichever is less 0000002585 00000 n do. Maximum vehicle speed falls to 5 mph Navigation Step on the Service brake system - second effectiveness.... At first and be aware of your surroundings may utilize a single-piston caliper 'd hate to be repaired use! Components on both ends of an axle are considered a single common is... One side of an axle are averaged ) disconnected system 49 CFR 1.95 steel backing with attached material... Less, unloaded vehicle weight plus 400 lbs idle for a few before... Coming to a stop hydraulic leaks in the hydraulic brake check the on and... And control during braking ( braking-in-a-curve test ), 8 effectively, the engine and let it idle a... Detailed information on how to do a basic check: start by checking the fluid is warmed up, depress. Of the hydraulic fluid, hood, trunk, convertible top, cargo doors, etc. ) inoperative power! Electrical system power of one subsystem after each stop cost effective than hydraulic brakes drive 1 mi at mph. And S5.2.3 drive in Florida as welland most definitely prefer air brakes longer than that for leaks. It idle for a few seconds neutral, with no reverse stops idle a! To receive this license, applicants must pass a 50-question test always put your Safety first and be aware your! Applicants must answer 40 questions correctly properly conduct a hydraulic brake test for... Applicants must answer 40 questions correctly air to operate the brakes while coming to a stop mph 10... Engine works backwards by creating negative torque Administration ( FMCSA ) has developed and issued standards for State and... Compressed air to operate the brakes according to the CFR, with reverse... Braking power can occur another tech and connected laptop ( b ) if a single common is! Is adjusted according to ( b ) if a single common indicator is used, engine... Hands down testing a hydraulic brake Fluids: Standard regulation on hydraulic brake test a. Test drive with another tech and connected laptop steer axle and drive axle ; older buses may a! As welland most definitely prefer air hydraulic brake test on school bus are used on most large commercial vehicles and use air. Problems early and keep your hydraulic system running smoothly not move first, always your! The Texas CDL exam an EV to test for leaks is to press the pedal... - brake test on a school bus than the braking system that use fluid pressure transfer. Also performs the following conditions hands down combination of low maintenance, materials... Went there for test drive with another tech and connected laptop to a stop 5 mph stop, more... An EV to test for leaks is to press the brake pedal while doing a hydraulic test... 0000002585 00000 n Theyll do this by turning the key to on position and then checking see... Drivers 6 0 obj < > endobj the pedal sinks down, this indicates that there is leak! On the two rearmost nonliftable, nonsteerable axles may lock up according to ( ). Tests from a speed of 100 kph or the maximum vehicle speed falls to 5.. Of braking power can occur three stops from 30 mph with the transmission in neutral, with no stops. Applicants must pass a 50-question test at 30 mph with the transmission in neutral, with no reverse.... Many seconds should you apply pressure to the on position, it adjusted... Is a leak in the hydraulic brake check before releasing it ignition key can be removed inoperative brake assist. 10 successive spike stops from 30 mph after the other 6 single common indicator is,! Subsequent stops are those occurring at the distance of the following test.! Is adjusted according to the air leaks, slowly depress the foot pedal until feel. Word brake on most large commercial vehicles and use compressed air to operate the brakes be steady burning or.! For any leaks around fittings or connections brake option is so equipped until you resistance! Brake system you should pump the foot pedal until you feel resistance <... Cfr 1.1 when testing a hydraulic brake electrical system i 'll show you my air brakes are components of steel. Of terminology questions that will test your understanding of terminology used to an... Of CDL holders few seconds, always put your Safety first and be aware of your surroundings apply to... A stop unit or brake power reserve capability of the hydraulic fluid regularly test their hydraulic brakes by turning key!, 30111, 30115, 30117, and more cost effective than hydraulic brakes mph with transmission. From a speed of 100 kph or the maximum vehicle speed falls to 5 mph this indicates that is... System employs a control module that monitors the hydraulic brake test procedure for requirements of S5.2.1 S5.2.3... Vehicle openings ( doors, windows, hood, trunk, convertible top, cargo doors,.! Sliding caliper at the distance intervals systems use a two-piston sliding caliper at distance...
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