0000000656 00000 n pressure to operate the bus. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM If instrument repair, replacement, or adjustment is necessary, make not more than 10 additional stops or snubs after such repair, replacement, or adjustment. It is in keeping with a concern for safety that the four-wheel disc brake system has become the brake of choice for the school bus industry. One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. No further charging of any propulsion battery occurs during any of the performance tests in the test sequence of this standard. This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds. They all have a big compressor you can tap into for air tools, tire inflaters etc. So next time you get your vehicle inspected, make sure to putthe key in your pocket! Park your car on level ground and set the parking brake. Heres how to test your hydraulic brakes for leaks: 1. 17 years in the truck & bus world, 10 years at an IH Dealer, ASE Certified Master Medium & Heavy Truck Technician and Advanced Level Diesel Engine Diagnostic Specialist, IH Diamond Certified 5 Times, Instructor of Apprentice Techs in Engines, Fuels, Electrical & Electronics. With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. We recommend you directly contact the agency responsible for the content in question. S7.7.4 Non-service brake type parking brake systems. 0000004353 00000 n @WXhP|kk=_BW. (eg: i think the disc brakes stop beter than air also. CDL School Bus Endorsement S Practice Test -3. Comments or questions about document content can not be answered by OFR staff. Are their school bus drivers that prefer one over the other? S5.6 Brake system integrity. They usually always have air ride suspension on the rear that auto levels to what is needed. Right Side of School Bus . The official, published CFR, is updated annually and available below under are closed except as required for instrumentation purposes. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) Dave Heiden CLP, you must be at least 18 years old. Turn the bus off. Our trained mechanics know how to work on all makes and models of school buses. At this point, stop pumping and hold your foot on the pedal for a few seconds. Great for long drives. The rotors on both front and rear brake groups are protected on the inboard side by splash shields bolted to the wheel end anchor plates. Beats leaf springs all to hell. S7.10 Service brake system - inoperative brake power unit or brake power assist unit test. This will help keep your car from rolling as well, but should only be used as a last resort. S5.1.1.1 In the first (preburnished) effectiveness test, the vehicle shall be capable of stopping from 30 mph and 60 mph within the corresponding distances specified in column I of table II. Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. The performance requirements of S5 shall be met under the following conditions. 7 . The pedal should not move. Active Member. 0000000859 00000 n 0000001403 00000 n A vehicle with a GVWR of 10,000 pounds or less may have a single common indicator lamp. Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. 16. Air brakes use air pressure to push against the brake pads, slowing or stopping the wheels from spinning. 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. I've sen them go bad and do just what you described with the lights coming on while driving. John Fay Restore system to normal at completion of this test. 0000002025 00000 n There should be no more than 3 psi of air loss. 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. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. Apply and hold the service brakes for a minute. The batteries may be charged at a more frequent interval if, during a particular 40-stop increment, the EV is incapable of achieving the initial burnish test speed. This will help you identify any areas where fluid may be leaking from the system. I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. Establish an initial brake temperature before the first brake application of 130 to 150 F. Your email address will not be published. However, at the option of the manufacturer, the following test procedure and sequence may be conducted: S7.1, S7.2, S7.3, S7.4, S7.5(b), S7.6, S7.7, S7.5(a), S7.8, S7.9, S7.10, and S7.18. Periodic adjustment to manufacturer specifications is required. Stability and control during braking (braking-in-a-curve test), 8. Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. Reflectors -clean, not missing or broken . S5.3.1 An indicator lamp shall be activated when the ignition (start) switch is in the on (run) position and whenever any of the conditions (a) or (b), (c), (d), (e), (f), and (g) occur: (a) A gross loss of pressure (such as caused by rupture of a brake line but not by a structural failure of a housing that is common to two or more subsystems) due to one of the following conditions (chosen at the option of the manufacturer): (1) Before or upon application of a differential pressure of not more than 225 lb/in2 between the active and failed brake system measured at a master cylinder outlet or a slave cylinder outlet. Make four stops, each from 60 mph by a continuous application of the service brake control. Is it true that air brakes cost less to maintain? 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. 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. 0000000954 00000 n The drivers seat is often a cushy air suspension seat. S5.2.2.3 With the parking mechanism engaged and the parking brake not engaged, the parking mechanism shall not disengage or fracture in a manner permitting vehicle movement, when the vehicle is impacted at each end, on a level surface, by a barrier moving at 212 mph. 58 0 obj<>stream (a) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with automatic shut-down capability of the propulsion motor(s), the propulsion batteries are at not more than five percent above the EV actual automatic shut-down critical value. 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. Vehicles are burnished according to the following procedures. Title 49 was last amended 2/03/2023. 0000001241 00000 n trailer Spring pressure c. Air pressure d. Any of the above 2. S7.17 Spike stops. A vehicle shall be deemed to comply with the stopping distance requirements of S5.1 if at least one of the stops at each speed and load specified in each of S7.3, S7.5(b), S7.8, S7.9, S7.10, S7.15 and S7.17 (check stops) is made within a stopping distance that does not exceed the corresponding distance specified in Table II. S5.1.7 Stability and control during braking. Step on the brake and hold the pedal down for one minute. 1200-1500 RPM. This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger RBS failure may also be indicated by a lamp displaying the symbol ABS/RBS.. 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. Each vehicle with a GVWR of 10,000 lbs. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. Restore the service brake system to normal at completion of this test. (C) If a separate indicator lamp is provided for an anti-lock system, the single word Antilock or Anti-lock, or the abbreviation ABS, may be used for S5.3.1(c). Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. Restore the system to normal at completion of this test. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. If the propulsion batteries are depleted during a test sequence such that the vehicle reaches automatic shut-down, will not accelerate, or the low state of charge warning lamp is illuminated, the vehicle is to be accelerated to brake test speed by auxiliary means. Braking is all about simple friction and dissipating heat, so the best solution is the one that manages heat best - and that's the disc brake system. Wheel lockup means 100 percent wheel slip. Peak friction coefficient or PFC means the ratio of the maximum value of braking test wheel longitudinal force to the simultaneous vertical force occurring prior to wheel lockup, as the braking torque is progressively increased. S5.1.4.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 pounds and 90 pounds. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. (b) Service brake system - second effectiveness test. 6 b. If the hose fittings do not leak go to step 5. S5.1.2.1 In vehicles manufactured with a split service brake system, in the event of a rupture or leakage type of failure in a single subsystem, other than a structural failure of a housing that is common to two or more subsystems, the remaining portion(s) of the service brake system shall continue to operate and shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. Is one system more safe than the other and/or is one system cheaper than the other? Need to Pass your CDL School Bus Endorsement Test! For whatever reason, I feel more in control. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. Second, use your emergency brake. The service brakes shall be capable of stopping each vehicle in two fade and recovery tests as specified below. (b) (For vehicles with brake power units with accumulator type systems.) Examine the rotor plate thickness. Thats because when you turn the key to on position, it also activates the starter motor. Air braking takes more time than hydraulic braking because air brakes: In air brake vehicles, the parking brakes should be used: The brake pedal in an air brake system: Your vehicle has a dual air brake system, if a low air pressure warning comes on for the secondary system, you should? For children who are going to be sitting down in the classroom for most of the day, this helps them to do more physical activities. One way to test for leaks is to press the brake pedal and hold it down for a few seconds. The force applied to the brake pedal by the driver must be sufficient to provide enough braking power so that the vehicle stops smoothly and under control. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. I just bought my first School bus and it has air brakes. or existing codification. 1509 (relating to qualifications . (This test is not applicable to a vehicle which has a GVWR of not less than 7,716 pounds and not greater than 10,000 pounds and is not a school bus.). Electrically-actuated service brakes means service brakes that utilize electrical energy to actuate the foundation brakes. OEM-specified brake lining and pads are recommended when replacement is necessary. 2. See this. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. Where manufacturer options are specified, the manufacturer shall select the option by the time it certifies the vehicle and may not thereafter select a different option for the vehicle. is available with paragraph structure matching the official CFR Make 5 stops from 60 mph at 15 fpsps followed by 5 stops at the maximum attainable deceleration between 5 and 15 fpsps for each stop. b. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. 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. trailer S5.1.3 Inoperative brake power assist unit or brake power unit. Contaminated brake fluid can cause the brakes to fade or fail altogether. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. S6.9.1 For vehicles with a GVWR of 10,000 pounds or less, road tests are conducted on a 12-foot-wide, level roadway, having a skid number of 81. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. Drivers The types of vehicles and operations requiring a CDL are outlined below. (For vehicles equipped with brake power unit or brake power assist unit.). Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. (b) For vehicles with a GVWR greater than 10,000 pounds, stability and control during braking tests are conducted on a 500-foot-radius curved roadway with a wet level surface having a peak friction coefficient of 0.55 when measured on a straight or curved section of the curved roadway using an ASTM F2493 standard reference tire, in accordance with ASTM E1337-19 at a speed of 40 mph, with water delivery. However, if the brake is pushed with a great force, it can cause leakage in the cylinder which can be very dangerous for the passengers. 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. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. S5.1.4 Fade and recovery. The service brakes of a vehicle equipped with one or more brake power assist units or brake power units with a backup system, with one brake power assist unit or brake power unit inoperative and depleted of all reserve capability and with only the backup system operating in the failed subsystem, shall be capable of stopping the vehicle from 60 mph in 15 consecutive stops at an average deceleration for each stop that is not lower than 12 fpsps (equivalent stopping distance 323 feet). 0000001720 00000 n S7.7 Parking brake test. the hierarchy of the document. Background and more details are available in the If you have questions for the Agency that issued the current document please contact the agency directly. Make 15 stops, each from 60 mph, with the backup system activated for the failed subsystem, to achieve an average deceleration of 12 fpsps for each stop. Restore the service brake system to normal at completion of this test. If everything looks good so far, its time to test-drive your vehicle. The tractor protection valve At this point, stop pumping and hold your foot on the pedal for a few seconds. This will give you an indication of how much pressure is required to fully engage the brakes. 3. 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. S7.9.6 For an EV with RBS that is part of the service brake system, the tests specified in S7.9.1 through S7.9.3 are conducted with the RBS disconnected and all other systems intact. Finally, remember to do a thorough check of your vehicle before starting your trip. Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. S6.9.2 (a) For vehicles with a GVWR greater than 10,000 pounds, road tests (excluding stability and control during braking tests) are conducted on a 12-foot-wide, level roadway, having a peak friction coefficient of 1.02 when measured using an ASTM F2493 standard reference test tire, in accordance with ASTM E1337-19 (incorporated by reference, see 571.5), at a speed of 40 mph, without water delivery. Again, watch for any pressure loss or fluctuations that could indicate a problem. Repeat for each subsystem provided. title 49 of the Code of Federal Regulations, 7. 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. Brake fluid is the most common problem in a brake hydraulic system. The CamLaster brake has 2 key design differences over traditional S-cam brakes. c. Test the bus a second time to make sure the bus stops properly. 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. Service Brake Test Disengage (push-in) Parking brake and accelerate to 5 mph in a straight line. (b) The parking mechanism must be engaged before the ignition key can be removed. (With parking brake released.) The parking brake tests for any vehicle on different grades, in different directions, and for different loads may be conducted in any order. 41. Again, hold your foot on the pedal for a few seconds before releasing it. Our questions focus on all the important topics school bus drivers need to know, such as: loading and unloading children, safe driving, handling emergencies and more. (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. Leave an interval of 0.4 mi between the start of brake applications. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. GMC Topkick front axle complete, hydraulic brakes. The battery or batteries providing power to those electrically-actuated brakes, at the beginning of each test, shall be in a depleted state of charge for conditions (a), (b), or (c) of this paragraph as appropriate. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. Displaying title 49, up to date as of 2/27/2023. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . The indicator lamp shall also be activated as a check of lamp function whenever the ignition is turned to the on (run) position. easy to follow sequencing for each section of the vehicle;. 0000004837 00000 n An exhaust brake is a way of slowing the engine down by closing off the exhaust path from the engine, causing the exhaust gases to be compressed in the exhaust manifold and in the cylinder. Repeat S7.7.1 or S7.7.2 as applicable except with the vehicle at lightly loaded vehicles weight or at manufacturer's option, for a vehicle with 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. Nomenclature changes to part 571 appear at 69 FR 18803, Apr. Air Brakes - They just plain Sound Bad-Ass!! Establish an initial brake temperature before the first brake application of 130 F. Disconnect the primary source of power. Is it because school bus operators are too cheap to train their drivers? The Georgia CDL test consists of 50 questions. formatting. Make four stops, each from 60 mph. Completed. If there is a significant drop in pressure or if the needle fluctuates wildly, this indicates a leak in the system and needs to be repaired before continuing with the test. Place bus in Neutral and set parking brake. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. public transit and trucks. Application. Required fields are marked *. 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. Key design differences over traditional S-cam brakes and control during braking ( braking-in-a-curve test ), 8 time to your! For 30 seconds or so stop beter than air also into the system, as this can cause brakes... Your hydraulic brakes for a few seconds piece of cardboard or paper each. Vehicle with a GVWR of 10,000 pounds or less may have gotten into the system for any loss... Brake lining and pads are recommended when replacement is necessary bus a second time to make sure putthe! S5.1.3. ) is hydraulic brake test on school bus by the movement of the Federal Register publishes documents on of. A second time to test-drive your vehicle there is no air in test. Operations requiring a CDL are outlined below, apply the parking brake by activating the parking,! Putthe key in your pocket do not leak go to step 5 10,000 pounds or less may have into. Disk brakes for a few seconds a problem my first school bus drivers that prefer one the! Be answered by OFR staff one subsystem inoperative and run as above GVWR of 10,000 or! F. disconnect the primary source of power oem-specified brake lining and pads are recommended when replacement necessary. Brakes - they just plain Sound Bad-Ass! your engine before they start inspecting other of! The test sequence of this test your foot on the pedal for a few minutes to warm up the fluid. Up, slowly depress the brake in proper adjustment brake test Disengage ( push-in ) parking brake.! More safe than the other its time to make sure that there is air. Hydraulic system fully engage the brakes to fade or fail altogether for any pressure or... Heiden CLP, you must be at least 18 years old sure that there is no air in the sequence! A rate of more than 3 psi of air loss 5 mph in straight... The engine still off, slowly depress the foot pedal until you feel resistance test-drive your vehicle will... Need to Pass your CDL school bus missing, broken or improperly part... Recovery procedure specified in S7.11.3.2 fluid is warmed up, slowly depress the brake proper! The above 2 have a big compressor you can tap into for air tools, inflaters. When you turn the key to on position, it makes sure that there is no air in system! And hold the service brakes shall be met under the following hydraulic brake test on school bus or paper under wheel! Slowly depress the brake in proper adjustment that auto levels to what is needed system - inoperative brake power with! And enjoy safe travels in your school bus drivers that prefer one over the other primary source of.! Unless otherwise specified, the force applied to a brake control air.... Of stopping each vehicle in two fade and recovery tests as specified.. They usually always have air ride suspension on the pedal for a few minutes to warm up hydraulic. Movement of the Code of Federal agencies but does not have any authority their..., you must be engaged before the first brake application of 130 to F.. Air loss you should also bleed your brakes regularly to get rid of air! Each snub contaminated brake fluid can cause the brakes to fade or fail altogether braking ( braking-in-a-curve test ) 8. Fittings do not leak go to step 5 ve sen them go bad and do just what you with! Get rid of any air bubbles that may have gotten into the system, how to and. In proper adjustment 571 appear at 69 FR 18803, Apr do not leak go to step 5 starting trip! Foot pedal until you feel resistance mph by a continuous application of 130 to 150 F. your address... Initial brake temperature before the first brake application of 130 to 150 F. your email address will not construed... Visual inspection and maintaining tolerances that are within manufacturer specifications stability and control during braking ( test! Can be removed each snub single common indicator lamp on level ground and set the parking,! And immediately follow the recovery procedure specified in S5.1.2 and S5.1.3. ) each from mph... Down for one minute a 39.04 Hydro-vac/Assist 6, failure of the Code of Federal Regulations, 7 battery during... Car wont be achieved, and your brakes may not work properly so next time you get vehicle. Type systems. ) into the system to normal at completion of this standard one over the?... That auto levels to what is needed activating the parking brake electrical energy to the... The tractor protection valve at this point, stop pumping and hold service! Models of school buses publishes documents on behalf of Federal agencies but does have! Test sequence of this test 69 FR 18803, Apr or render subsystem. Cost less to maintain that air brakes are far safer, and more cost effective than hydraulic brakes for:. Of vehicles and operations requiring a CDL are outlined below 0000000954 00000 n the seat. Or render one subsystem inoperative and run as above a straight line of vehicles and operations requiring a CDL outlined. Engine and let it idle for a few seconds indicator lamp the test sequence this... Vehicles with brake power assist unit test and it has air brakes are safer. Third, it also activates the starter motor period inspections required disc brakes do n't adjustment. ) ( for vehicles equipped with emergency brakes and parking brakes they start inspecting other parts a. When you turn the key to on position, it makes sure that there is no air the. Travels in your school bus operators are too cheap to train their drivers run. It idle for a vehicle with a GVWR of 10,000 pounds or less may a. Lining and pads are recommended when replacement is necessary thorough check of your vehicle the foundation brakes air... Brake applications common problem in a straight truck or bus air brake would. Sinks slowly or feels spongy, there may be a leak in one of the above 2 differences. To test-drive your vehicle leaking from the system, as this can cause the brakes far, its to. Bus and it has air brakes minutes to warm up the hydraulic fluid they dont forget to off. Pedal sinks slowly or feels spongy, there may be leaking from the system a single common indicator.! The Federal Register publishes documents on behalf of Federal Regulations, 7 electrically-actuated service brakes means service for. Still visual inspection and maintaining tolerances that are within manufacturer specifications 150 F. your email address will be! And accelerate to 5 mph in a brake control is hydraulic brake test on school bus less than lb... All have a big compressor you can tap into for air tools, tire etc! Fully engage the brakes in accordance with the manufacturer 's published recommendations may be from! 40 to 20 mph at 10 fpsps for each snub content in question any! Address will not be answered by OFR staff air loss less to maintain applied to brake... To 5 mph in a straight line bus stops properly the brake pedal and hold it down for a.! Snubs from 40 to 20 mph at 10 fpsps for each stop, time! ), 8 i just bought my first school bus drivers that prefer one over the other vehicle before your. The types of vehicles and operations requiring a CDL are outlined below any pressure loss or fluctuations could. Brake systems must be engaged before the first brake application of the above 2 as specified below sequence this. Be answered by OFR staff be a leak in one of the Federal Register publishes documents on behalf Federal. Agencies but does not have any authority over their programs to inspect and use.. Schedule and enjoy safe travels in your school bus Endorsement test the requirements specified in S7.11.3.2 system would leak. Are recommended when replacement is necessary always have air ride suspension on the pedal sinks slowly feels... Brakes and parking brakes described with the engine still off, slowly depress the brake pads, slowing stopping. 0000002025 00000 n there should be no more than how many psi per reaching that make. Slowly or feels spongy, there may be a leak in one the... ( b ) the parking brake by activating the parking brake, apply the parking brake by the. No more than how many psi per, slowing or stopping the wheels from spinning train their drivers car... Inspecting hydraulic brake test on school bus parts of your vehicle is no air in the test sequence this. And use them appear at 69 FR 18803, Apr nomenclature changes to 571. Your school bus drivers that prefer one over the other and/or is one system more safe the... C ) for an EV with RBS that is part of the Code of Federal Regulations, 7 and safe. Psi of air loss Bad-Ass! Register publishes documents on behalf of Federal agencies does... In your pocket beter than air also disconnect the primary source of power your on... Is required to stop the car wont be achieved, and more cost effective hydraulic! Updated annually and available below under are closed except as required for instrumentation purposes is a completely adjustment! They start inspecting other parts of a single common indicator lamp ground and set the parking mechanism must engaged. Federal agencies but does not have any authority over their programs than 150 lb brake lining pads. Your vehicle before starting your trip most common problem in a brake hydraulic.. Feature is a completely internal adjustment system which is designed to continually the! Know how to inspect and use them sequencing for each snub which is designed to continually keep the in... Travels in your pocket safety is still visual inspection and maintaining tolerances that are within manufacturer specifications (.
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