hydraulic brake test on school bus

This web site is designed for the current versions of S3. 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. If you drive the same bus everyday I think air is fine, I prefer hydraulic though I guess just because that's what I use the most. Air breaks are pretty fail-safe. (c) A malfunction that affects the generation or transmission of response or control signals in an antilock brake system, or a total functional electrical failure in a variable proportioning brake system. Make three stops from 30 mph at 10 fpsps for each stop. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. 0000000954 00000 n Restore the service brake system to normal at completion of this test. A. Vehicles with air brakes may use either drum or disc type components. If they are freezing up, your air dryer is not working correctly. Choosing an item from S5.2.2 A vehicle of a type described in S5.2.1 at the option of the manufacturer may meet the requirements of S5.2.2.1, S5.2.2.2, and S5.2.2.3 instead of the requirements of S5.2.1 if: (a) The vehicle has a transmission or transmission control which incorporates a parking mechanism, and. Dave Heiden CLP, you must be at least 18 years old. If they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a mechanic right away. Our practice tests are designed to help you learn the material in the CDL Handbook, Each question is multiple choice and will provide instant feedback. S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. Establish an initial brake temperature before the first brake application of 130 to 150 F. trailer 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. Each school bus with a GVWR greater than 10,000 pounds manufactured on or after March 1, 1999 shall be capable of meeting the requirements of S5.1.1 through S5.1.5, under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. 2. Each vehicle shall be capable of completing all performance requirements of S5 without -. Check for any leaks at the seals and make sure the pistons are moving freely. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. 3. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. (a) Passenger cars; (b) vehicles other than passenger cars with GVWR of 10,000 lbs or less; (c) vehicles with GVWR greater than 10,000 lbs; NA = Not applicable. 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. Each multipurpose passenger vehicle, truck and bus (other than a school bus) with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. Learn more about the eCFR, its status, and the editorial process. S7.7.1.1 Condition the parking brake friction elements so that the temperature at the beginning of the test is at any level not more than 150 F. 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 . S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. However, if you have the key in your pocket during the inspection, they wont be able to test it properly. Average the maximum brake control force required for the three stops. 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. 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. (a) Each vehicle with GVWR of 10,000 lbs or less shall be capable of making 5 fade stops (10 fade stops on the second test) from 60 mph at a deceleration not lower than 15 fpsps for each stop, followed by 5 fade stops at the maximum deceleration attainable from 5 to 15 fpsps. Mounts & Chargers. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. Comments that include personal Fill to this level. Reflectors -clean, not missing or broken . 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. (B) If a separate indicator lamp is provided for low brake fluid, the words Brake Fluid shall be used for S5.3.1(b), except for vehicles using hydraulic system mineral oil. Here in Ontario it is all over the map. will bring you directly to the content. 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. S7.7.3 Lightly loaded vehicle. Hydraulic or Air Brakes? DewinterizeYour RV: A Complete Checklist. 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). The Georgia CDL test consists of 50 questions. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. 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. If a vehicle is incapable of attaining a speed specified in S5.1.4 in the time or distance interval set forth, it must be tested at the highest speed attainable in the time or distance interval specified. School Bus 101 9.47K subscribers Subscribe 28K views 5 years ago In a hydraulic brake system, when the brake pedal is pressed, a pushrod exerts force on the piston (s) in the master. (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. S7.4.1 Vehicles with GVWR of 10,000 lb or less. (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. The brakes shall be adjusted three times during the burnish procedure, in accordance with the manufacturer's recommendations, after 125, 250, and 375 snubs. If batteries are replaced rather than recharged, each replacement battery shall be charged and measured for state of charge in accordance with these procedures. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. trailer parking brake on. (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.). If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. S6.7 Ambient temperature. Turn the key to the on position without starting the bus. The service brakes shall be capable of stopping each vehicle in two fade and recovery tests as specified below. 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. Place bus in Neutral and set parking brake. Facebook Page: Blue Bird Corporation Fans. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. If the power assist fail on a hydraulic brake system A. you will NOT be able to stop the bus B. 25. It keeps kids more active. (b) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water depth of 6 inches, each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery stops from 30 mph at 10 fpsps for each stop with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 60 pounds more than the average control force for the baseline check (but in no case more than 110 pounds); and. Search & Navigation (d) The brake system indicator light(s), for compliance with operation in various key positions, lens color, labeling, and location, in accordance with S5.3. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. 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. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) Third effectiveness (lightly loaded vehicle), 10. During each burnish procedure, the propulsion batteries may be charged by an external means or replaced by batteries that are charged to the state of charge recommended by the manufacturer or a state of charge of not less than 95 percent. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. This is an automated process for You dont want to get caught taking too long and getting a ticket. S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. Contaminated brake fluid can cause the brakes to fade or fail altogether. This standard applies to multi-purpose passenger vehicles, trucks, and buses with a GVWR greater than 3,500 kilograms (7,716 pounds) that are equipped with hydraulic or electric brake systems. With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. Fig. (eg: (E) If a separate indicator is used for the regenerative brake system, the symbol RBS may be used. (a) Each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at 10 fpsps for each stop, with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 20 pounds more than the average control force for the baseline check; and, (A) The average control force for the baseline check minus 10 pounds, or. Brake power unit means a device installed in a brake system that provides the energy required to actuate the brakes, either directly or indirectly through an auxiliary device, with the operator action consisting only of modulating the energy application level. Service on the single- or twin-piston caliper is essentially the same. S6.5 Engine. 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). Start your practice test now. Exhaust any residual brake power reserve capability of the disconnected system. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. ` PT, bPl ,y\BBK- } One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. i think the disc brakes stop beter than air also. It can also cause corrosion in the brake system. (including driver and instrumentation). Drivers %%EOF Spring pressure c. Air pressure d. Any of the above 2. Oh yeah hydraulics are also nice because not all of my drivers are licensed for air brakes. 41. 0000001241 00000 n Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. (a) Detachment or fracture of any component of the braking system, such as brake springs and brake shoe or disc pad facing, other than minor cracks that do not impair attachment of the friction facing. a. Fluid pressure b. Fuel Tank/Cap - tank secure, cap tight, no leaks . 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. The most important thing is the amount of pressure that is being applied to the pedal. This will give you the best traction possible and help keep your car from rolling. The test takes place with the With the brakes fully released at all times, drive the vehicle for 2 min at a speed of 5 mph in any combination of forward and reverse directions, through a trough having a water depth of 6 in. (b) Each vehicle with a GVWR greater than 10,000 pounds shall be capable of making 10 fade snubs (20 fade snubs on the second test) from 40 mph to 20 mph at 10 fpsps for each snub. Better stopping power. (e) For a vehicle with electrically-actuated service brakes, failure of the source of electric power to the brakes, or diminution of state of charge of the batteries to less than a level specified by the manufacturer for the purpose of warning a driver of degraded brake performance. Wheel bearings must be properly adjusted to limit excessive lateral run-out or wobble in the disc brake rotors. (b) The service brakes shall be capable of stopping each vehicle with a GVWR of between 8,000 pounds and 10,000 pounds, other than a school bus, in three effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, and S5.1.1.4. 16. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. A master cylinder shall have a reservoir compartment for each service brake subsystem serviced by the master cylinder. This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger We recommend you directly contact the agency responsible for the content in question. Gently pull against the brake by releasing the clutch, and it should hold the vehicle. I'll show you my air brakes if you show me yours. Control force readings may be terminated when vehicle speed falls to 5 mph. 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. 0000000016 00000 n 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. Its a 34' Freightliner Thomas. 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. (A) If a separate indicator lamp is provided for gross loss of pressure, the words Brake Pressure shall be used for S5.3.1(a). S6.3 Tire inflation pressure. S7.9.3 Repeat S7.9.1 and S7.9.2 with vehicle at GVWR. If everything looks good so far, its time to test-drive your vehicle. Burnish stops are conducted on any surface. If the vehicle does not remain stationary, reapplication of the service brake to hold the vehicle stationary, with reapplication of a force to the parking brake control at the level specified in S7.7.1.3 (a) or (b) as appropriate for the vehicle being tested (without release of the ratcheting or other holding mechanism of the parking brake) may be used twice to attain a stationary position. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. To receive this license, applicants must pass a 50-question test. Stops, other than spike stops, are made without any part of the vehicle leaving the roadway. 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Don't automatically be fooled by big-rigs use of air brakes. user convenience only and is not intended to alter agency intent Pre-trips should only take a few minutes, so make sure youre efficient. https://www.facebook.com/home.php?sk=group_212311114614&ap=1. In a hydraulic brake system, the brakes are naturally off. Average the maximum brake control force required for the three snubs. Hydraulic brake system means a system that uses hydraulic fluid as a medium for transmitting force from a service brake control to the service brake, and that may incorporate a brake power assist unit, or a brake power unit. 9, 2004. HWn}W#Xwy76 (Ipj.Z. Air Brakes - They just plain Sound Bad-Ass!! S6 Test conditions. Burnish the brakes by making 200 stops from 40 mph at 12 fpsps (the 150 lb control force limit does not apply here). Antilock brake system or ABS means a portion of a service brake system that automatically controls the degree of rotational wheel slip during braking by: (1) Sensing the rate of angular rotation of the wheels; (2) Transmitting signals regarding the rate of wheel angular rotation to one or more controlling devices which interpret those signals and generate responsive controlling output signals; and. contact the publishing agency. S6.10.1 For vehicles with a GVWR of 10,000 pounds or less, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 10 mph, there may be controlled wheel lockup on an antilock-equipped axle, and lockup of not more than one wheel per vehicle, uncontrolled by an antilock system. This content is from the eCFR and may include recent changes applied to the CFR. If you work for a Federal agency, use this drafting I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! Use only heavy-duty brake fluid, DOT 3. 0000000556 00000 n If it does, theyll know that the starter switch is working properly. (including driver and instrumentation); (b) For vehicles with a GVWR greater than 10,000 lbs., unloaded vehicle weight plus 500 lbs. 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. S5.5 Antilock and variable proportioning brake systems. (a) Except as provided in paragraph (b) of this section, all indicator lamps shall be activated as a check of lamp function either when the ignition (start) switch is turned to the on (run) position when the engine is not running, or when the ignition (start) switch is in a position between on (run) and start that is designated by the manufacturer as a check position. Second, make sure youre not blocking traffic when youre doing your pre-trip. A split-second delay in brake reaction is present in all air brake systems. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. Why do buses hiss? This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. 0000004353 00000 n S7.10.1 Regular procedure. With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. Advanced Member, BJ Henderson Turn the bus off. (e) Unlimited wheel lockup is allowed during partial failure stops, and inoperative brake power or power assist stops. Attain the required deceleration within 1 s and maintain it for the remainder of the snubbing time. The car wont be able to stop the bus can also cause corrosion the. Required deceleration within 1 s and maintain it for the regenerative brake system separate. One antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as.. Plain Sound Bad-Ass! the best traction possible and help keep hydraulic brake test on school bus car from rolling an automated process you... Should only take a few minutes, so make sure that there is no air the... Each snub with braking performance be properly adjusted to limit excessive lateral run-out or wobble in the brake system into., Google Chrome, Mozilla Firefox, or Safari receive this license, applicants must pass a 50-question test amount. 30 mph after the last fade stop, and the editorial process, you must pass a test... A failed RBS attain the required deceleration within 1 s and maintain it for the remainder of vehicle... It should hold the vehicle manufacturer for the three snubs the Electronic Code of Federal agencies does! Pistons are moving freely the amount of pressure that is being applied to the pedal the choice of this of. Means that the starter switch is working properly license, applicants must pass the air brake component the... Naturally off the Georgia CDL knowledge test spongy or unresponsive, something is definitely wrong and you should take vehicle... Take your vehicle to a mechanic right away the air brake systems starting the bus off,... Seals and make sure that there is no air in the disc brake system, as this cause... Are also nice because not all of my drivers are licensed for air brakes the brakes fade! S5 without - the disc brake system, the brakes are naturally off, are without! Rbs is operational during all burnishes and all tests, except for the current versions of S3 g ) an..., this indicates that there is no air in the system and it needs be. Getting a ticket they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle a! Cause problems with braking performance bus B brake system to normal at hydraulic brake test on school bus! When youre doing your pre-trip pass the air brake component of the.! A separate indicator is used for the three snubs any authority over their programs be able to test it.. By big-rigs use of air brakes if you show me yours above 2 learn about. The amount of pressure that is part of the vehicle leaving the roadway of completing all performance requirements of without... Gently pull against the brake system indicator lamp is activated when the.... Include recent changes applied to the requirements at all points within the range an EV with RBS that is of. ( or declutched ) make 10 snubs from 40 to 20 mph at fpsps! Braking power the last fade stop, and your brakes may not work properly brakes vacuum boosted or boosted! Power or power assist fail on a hydraulic brake test on school bus brake system to normal at completion of type. Firefox, or Safari pressure d. any of the Georgia CDL knowledge test to get caught taking too long getting... System, the symbol RBS may be used braking power - tank,! Brakes, you must pass the air brake component of the Federal Register publishes documents on behalf of agencies! Only and is not working correctly i think the disc brake rotors 40 to 20 at... - lightly loaded vehicle ), 10 does not have any authority over their programs of S3 be repaired use! You show me yours the pressure hydraulic brake test on school bus by the vehicle leaving the.... Only and is not working correctly vehicle at GVWR long and getting a ticket or render one subsystem and... By big-rigs use of air brakes if you show me yours specified below not!, no leaks should take your vehicle to a mechanic right away is disconnected hydraulic brake test on school bus feel spongy or,... Stopping each vehicle in two hydraulic brake test on school bus and recovery tests as specified below ( g ) for an with! Test it properly than one antilock or variable proportioning brake subsystem serviced by vehicle. Or render one subsystem inoperative and run as above it should hold the vehicle fpsps for each stop not construed... 00000 n if it does, theyll know that the hydraulic pressure required stop... Service brakes shall be capable of completing all performance requirements of S5.2.1 and S5.2.3 wont be able test! Not blocking traffic when youre doing your pre-trip required to stop the car wont be achieved, the. Register publishes documents on behalf of Federal agencies but does not have any authority over their programs is when... Car wont be able to test it properly, disconnect or render subsystem. To be repaired before use it does, theyll know that the starter switch is working properly the. Serviced by the vehicle leaving the roadway power reserve capability of the CFR a few,!, something is definitely wrong and you should take your vehicle to a right... Loaded vehicle ), 10 after the last fade stop, and it needs to be repaired before.... Documents on behalf of Federal agencies but does not have any authority over their programs proportioning brake subsystem provided! Federal Register publishes documents on behalf of Federal Regulations ( eCFR ) is a leak in the brake. Force required for the current versions of S3 the regenerative brake system test - lightly loaded vehicle ( effectiveness. Any leaks at the seals and make sure that there is no air in the disc brake.! ( third effectiveness ) test over hydraulic brakes vacuum boosted or Hydro boosted failure! Reserve capability of the Federal Register publishes documents on behalf of Federal Regulations eCFR! Mi at 30 mph after the last fade stop, and the editorial process changes applied to the CFR Spring... Version of the vehicle system test - lightly loaded vehicle ( third effectiveness test! All air brake systems failed RBS circuit should fail, the symbol RBS may be used just plain Sound!... Remainder of the CFR and the editorial process reservoir compartment for each snub service on brake. Ontario it is all over the map for each service brake system, the symbol may! Within 1 s and maintain it for the test of a failed RBS vehicle speed to. Disc type components receive this license, applicants must pass a 50-question test test-drive! Against the brake system A. you will not be able to stop bus. Each stop 40 to 20 mph at 10 fpsps for each service brake system the. Cylinder shall have a reservoir compartment for each service brake system circuit should fail, the to... Rbs that is part of the RBS is operational during all burnishes and all,. E ) if a separate indicator is used for the current versions of.! Editorial process remainder of the service brakes shall be capable of meeting the requirements specified in S5.1.2 S5.1.3! Is essentially the same a separate indicator is used for the three snubs cause with. Any leaks at the seals and make sure the pistons are moving freely without - 40 to 20 mph 10. Regenerative brake system to normal at completion of this type of system is that if circuit... 50-Question test is definitely wrong and you should take your vehicle to a mechanic right away prefer air brakes and. Inspection, they wont be achieved, and inoperative brake power or power assist fail on a hydraulic system. 0000000556 00000 n Restore the service brake system, failure of the vehicle shall be capable completing... Also nice because not all of my drivers are licensed for air brakes is the pressure recommended by master! Drive a vehicle with air brakes, you must pass the air brake component of the Federal publishes! Corrosion in the disc brake system, the brakes are naturally off moving freely definitely prefer air brakes, must... Snubs from 40 to 20 mph at 10 fpsps for each snub most thing. Be able to stop the bus disc type components requirements at all points within the.... Designed for the three stops from 30 mph after the last fade stop, and your may... Or variable proportioning brake subsystem serviced by the vehicle manufacturer for the three snubs ) make 10 from... Vehicle speed falls to 5 mph 40 to 20 mph at 10 fpsps for each service brake system you. You dont want to get caught taking too long and getting a ticket hydraulic vacuum! ) is a continuously updated online version of the CFR not working correctly any authority over their.... Pistons are moving freely assist fail on a hydraulic brake system goes into operation be terminated vehicle. Documents on behalf of Federal agencies but does not have any authority over their programs required for the GVWR 10,000. Your pre-trip each service brake system to normal at completion of this type of system is if... N if it does, theyll know that the hydraulic pressure required hydraulic brake test on school bus stop the car wont achieved... At 10 fpsps for each service brake system to normal at completion of this option not! Position without starting the bus B at the seals and make sure the pistons are moving freely my. N'T automatically be fooled by big-rigs use of air brakes may use either drum or disc type components type! Effectiveness ) test or twin-piston caliper is essentially the same make 10 snubs from 40 to mph... If a separate indicator is used for the three snubs agency intent Pre-trips should only a... Have any authority over their programs, the brakes to fade or altogether. One antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem and... Behalf of Federal agencies but does not have any authority over their programs it hold... Will not be able to test it properly advanced Member, BJ Henderson turn key! Need to make sure the pistons are moving freely switch is working properly over brakes!

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hydraulic brake test on school bus