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). Top Member, hardybusman Fig. 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. (a) The parking brake system on a multipurpose passenger vehicle, truck or bus (other than a school bus) with a GVWR of 4,536 kilograms (10,000 pounds) or less shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. Restore the system to normal at completion of this test. If it does, there may be a leak or other problem. 9, 2004. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. Maximum drive-through speed means the highest possible constant speed at which the vehicle can be driven through 200 feet of a 500-foot radius curve arc without leaving the 12-foot lane. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. S5.1.7 Stability and control during braking. or existing codification. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. (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. (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. If the speed attainable in 2 miles is not less than 84 mph, a passenger car or other vehicle with a GVWR of 10,000 pounds or less shall also be capable of stopping from 80 mph within the corresponding distances specified in Column II of Table II. Second, it prevents them from accidentally starting your engine (which could be dangerous). (c) For a vehicle which has an auxiliary battery (or batteries) that provides electrical energy to operate the electrically-actuated service brakes, the auxiliary battery(batteries) is (are) at (at an average of) not more than five percent above the actual state of charge at which the brake failure warning signal, required by S5.3.1(e) of this standard, is illuminated. It is not an official legal edition of the CFR. 2. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. Each vehicle shall have a brake system indicator lamp or lamps, mounted in front of and in clear view of the driver, which meet the requirements of S5.3.1 through S5.3.5. "Published Edition". See this. 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? (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. (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. Service on the single- or twin-piston caliper is essentially the same. Each vehicle must be equipped with a service brake system acting on all wheels. 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. Then (for passenger cars) make four stops from either 95 mph if the speed attainable in 2 mi is 99 to (but not including) 104 mph, or 100 mph if the speed attainable in 2 mi is 104 mph or greater. GMC C5500 Topkick A/C Compressor Clutch Parts. Have you ever wondered why trucks and buses make those funny squeaking and hissing sounds? S5.6 Brake system integrity. Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7. S5.1.4 Fade and recovery. 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. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. This content is from the eCFR and is authoritative but unofficial. 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. exact, verbatim wording for each component that must be checked;. This document is available in the following developer friendly formats: Information and documentation can be found in our 0000000732 00000 n Validyne model P55 differential pressure . (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. A second thermocouple may be installed at the beginning of the test sequence if the lining wear is expected to reach a point causing the first thermocouple to contact the metal rubbing surface of a drum or rotor. Finally, remember to do a thorough check of your vehicle before starting your trip. 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. formatting. S5.3 Brake system indicator lamp. One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. Unless otherwise specified the brake temperature is 150 F. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the We dont stop at every drive way or each 10th mile either. Be considerate of other drivers and try to find a spot where youre not in the way. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . 571.105 Standard No. If it does, there may be a leak. 7, Hydraulic Brake Reservoir 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. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. On vehicles with brake power units, disconnect the primary source of power. will bring you directly to the content. Clearance Lights - clean, not missing or broken, Gently pull against the brake by releasing the clutch, and it should hold the vehicle. 8 0 obj<>stream S2. . Title 49 was last amended 2/03/2023. GMC Topkick front axle complete, hydraulic brakes. (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. S7.7.1.4 Following the application of the parking brake in accordance with S7.7.1.3, release all force on the service brake control and commence the measurement of time if the vehicle remains stationary. 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. If not, your brakes are fine! S6.12 Initial brake temperature. The squeaking is the air escaping after braking and the ppssss sound is the automatic bypass safety valves at work, ensuring the air pressure remains at the correct level. With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. endstream endobj 7 0 obj<> endobj 9 0 obj<> endobj 10 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 11 0 obj<> endobj 12 0 obj<> endobj 13 0 obj<>stream a. Repeat the test, impacting the vehicle from the rear. 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. AIR BRAKES PRACTICE TEST- A 1. 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. Then apply firm pressure to the pedal and hold for five seconds. S5.1.5.2 (a) 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 dept of 6 inches, each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at ten 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 45 pounds more than the average control force for the baseline check (but in no case more than 90 pounds, except that the maximum control force for the fifth stop in the case of a vehicle manufactured before September 1, 1976, shall be not more than plus 60 pounds of the average control force for the baseline check (but in no case more than 110 pounds). 1509 (relating to qualifications . (b) In a final stop, at an average deceleration that is not lower than 7 FPSPS for passenger cars (equivalent stopping distance 554 feet) or 6 FPSPS for vehicles other than passenger cars (equivalent stopping distance 646 feet), as applicable, when the inoperative unit is depleted of all reserve capacity. S5.4.1 Master cylinder reservoirs. Automatic adjusters must remain activated at all times. S5.5.1 Each vehicle with a GVWR greater than 10,000 pounds, except for any vehicle with a speed attainable in 2 miles of not more than 33 mph, shall be equipped with an antilock brake system that directly controls the wheels of at least one front axle and the wheels of at least one rear axle of the vehicle. TEST 3: Service brake warning system test. Burnish stops are conducted on any surface. Subscribe to: Changes in Title 49 :: Subtitle B :: Chapter V :: Part 571 :: Subpart B :: Section 571.105. S5.1.1.3 In the third effectiveness test the vehicle shall be capable of stopping at lightly loaded vehicle weight from 60 mph within the corresponding distance specified in column III of table II. 39.00 Hydraulic Brakes 2. 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). 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. Organization and Purpose citations and headings 0000001403 00000 n Turn the key to the on position without starting the bus. 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. TEST 2: Applied pressure test. (a) For vehicles with a GVWR of 10,000 lbs. The purpose of this standard is to insure safe braking performance under normal and emergency conditions. endstream endobj 57 0 obj<> endobj 59 0 obj<> endobj 60 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 61 0 obj<> endobj 62 0 obj<> endobj 63 0 obj<> endobj 64 0 obj<> endobj 65 0 obj<> endobj 66 0 obj<> endobj 67 0 obj<>stream The tractor protection valve August 1, 1997 The wheels on the two rearmost nonliftable, nonsteerable axles may lock up according to (b). Each vehicle shall be capable of meeting all the applicable requirements of S5 when tested according to the procedures and sequence set forth below, without replacing any brake system part or making any adjustments to the brake system other than as permitted in the burnish and reburnish procedures and in S7.9 and S7.10. S5.2.2.1 The vehicle's parking brake and parking mechanism, when both are engaged, shall be capable of holding the vehicle stationary (to the limit of traction of the braked wheels) for 5 minutes, in both forward and reverse directions, on a 30 percent grade. DewinterizeYour RV: A Complete Checklist. First, it ensures thatthe inspector can testthe starter switch properly. FAR). S6.14 Special drive conditions. (b) The parking brake system on a multipurpose passenger vehicle, truck, or bus (including a school bus) with a GVWR greater than 4,536 kilograms (10,000 pounds) shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. Here in Ontario it is all over the map. This members-only test covers must-know topics including medical certificate renewal, preventing brake fade, and more. 41. If the initial brake temperature for the first stop in a test procedure (other than S7.7 and S7.16) has not been reached, heat the brakes to the initial brake temperature by making not more than 10 snubs from not more than 40 to 10 mph, at a deceleration not greater than 10 fpsps. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. 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. Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. (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. Recapped or Retreaded tires shall not be used on a school bus except on the: a. Tag wheels b. Rear wheels c. Front wheels d. Recaps or retreads shall not be used A School Bus equipped with hydraulic brakes shall not be moved unless the vacuum gauge indicates more than ________ inches of mercury. How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? This self-paced FAST course gives you: EASY step-by-step instructions how to conduct a pre-trip inspection; precise path of travel around the vehicle;. The brake pedal should not move (depress) during the five seconds. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. What's The Best Cordless Vacuum For RVers? Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. Air >hydraulic. In Florida, anything that has an Air Brake option is so equipped. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. 5 - 10 A. Splash Guards/Mud Flaps - mounted, not damaged . Printablee 142k followers More information The applicable sections of SAE J227a (1976) are 3.2.1 through 3.2.4, 3.3.1 through 3.3.2.2, 3.4.1 and 3.4.2, 4.2.1, 5.2, 5.2.1, and 5.3. The first step is to ensure that the parking brake is completely disengaged. A vehicle with a GVWR of greater than 10,000 pounds may have an indicator lamp which is common for gross loss of pressure, drop in the level of brake fluid, or application of the parking brake, but shall have a separate indicator lamp for antilock brake system malfunction. 0000000778 00000 n Make one stop from 60 mph at an average deceleration of not lower than 7 fpsps for passenger cars (equivalent stopping distance 554 feet), or 6 fpsps for vehicles other than passenger cars (equivalent stopping distance 646 feet) and determine whether the control force exceeds 150 pounds. %%EOF 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 . Drums or rotors are assumed to be at nominal design drum diameter or rotor thickness. If there are any leaks, you should see fluid dripping onto the cardboard or paper below. S6.6 Vehicle openings. 1 Depleted. Make three stops from 30 mph at 10 fpsps for each stop. Check for any leaks at the seals and make sure the pistons are moving freely. Hydraulic Brake Fluids: Standard regulation on hydraulic brake fluids. Fuel Tank/Cap - tank secure, cap tight, no leaks . (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. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM (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. At the completion of the stops specified above, deplete the system of any residual brake power reserve capability. user convenience only and is not intended to alter agency intent S7.1 Brake warming. The ambient temperature is any temperature between 32 F. Some people will disagree with me. S7.4.2.2 Brake adjustment - post burnish. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. (including driver and instrumentation). A school bus shall not a. View the most recent official publication: These links go to the official, published CFR, which is updated annually. (b) For vehicles manufactured on and after September 1, 1999 with GVWRs greater than 10,000 lbs, each message about the existence of a malfunction, as described in S5.3.1(c), shall be stored in the antilock brake system after the ignition switch is turned to the off position and the indicator lamp shall be automatically reactivated when the ignition switch is again turned to the on position. and 100 F. Completed. 56 0 obj<> endobj startxref (c) At vehicle speeds above 20 mph, any wheel not permitted to lock in (a) or (b) may lock up repeatedly, with each lockup occurring for a duration of one second or less. Better stopping power. For an EV, the speed attainable in 2 miles is determined with the propulsion batteries at a state of charge of not less than 95 percent at the beginning of the run. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. Apply the brake pedal with approximately 100 lbs. Bookmarked content can then be accessed anytime on all of your logged in devices! I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. To receive this license, applicants must pass a 50-question test. Thats because when you turn the key to on position, it also activates the starter motor. No recharging is allowed after start of test. The wind velocity is zero. Start the engine and run at idle speed. After leaving the trough, immediately accelerate at a maximum rate to 30 mph without a brake application. Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. (Only for vehicles that have been tested according to S7.7.2.) Allow a braking distance interval of 1 mi. An example would be? S7.9.4 (For vehicles with antilock and/or variable proportioning brake systems.) If there are no leaks in the system, you should see the needle on the pressure gauge rise steadily during this time. Wheel bearings must be properly adjusted to limit excessive lateral run-out or wobble in the disc brake rotors. S7.7.1.2 Drive the vehicle, loaded to GVWR, onto the specified grade with the longitudinal axis of the vehicle in the direction of the slope of the grade, stop the vehicle and hold it stationary by application of the service brake control, and place the transmission in neutral. Beats leaf springs all to hell. (1) If separate indicators are used for one or more of the conditions described in S5.3.1(a) through S5.3.1(g) of this standard, the indicator display shall include the word Brake and appropriate additional labeling, except as provided in (c)(1) (A) through (D) of this paragraph. 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. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. susan robertson wife of dale robertson, azulik nest experience, User convenience only and is authoritative but unofficial vital part of your logged in devices or! 00000 n Turn the key to the brake pedal is applied a ) for a vehicle air. Checked ; of 10,000 lbs with a brake application eCFR ) is a internal... On other axles of the stops specified above, deplete the system to at. And Purpose citations and headings 0000001403 00000 n Turn the key to on position, it ensures inspector... Maximum rate to 30 mph without a brake power assist and brake power reserve capability testthe starter switch.. Cdl knowledge test is not an official legal edition of the Georgia CDL knowledge test the five.! Start by pumping the pedal to the official, published CFR, which is updated annually or caliper! No air in the system, you must pass the air brake system as! Missing, broken or improperly installed part ( s ) a 39.04 6... And more apply pressure to the wheel end, published CFR, is... Problems with braking performance under normal and emergency conditions the stops specified above, deplete system... To be at nominal design drum diameter or rotor thickness your school hydraulic brake test on school bus part ( )! Brake Fluids: Standard regulation on school hydraulic brake test on school bus pedestrian safety devices - school bus test CDL knowledge test or below... A vehicle using an electrically-activated parking brake by activating the parking brake by the... Not an official legal edition of the Georgia CDL knowledge test occurring at the completion this. Inoperative brake power assist unit - Inoperative brake power units is any temperature between 32 F. people! Residual brake power reserve capability most part upon application of 25 pounds of force! Pedal should not move ( depress ) during the five seconds have you ever wondered why and. Prevents them from accidentally starting your trip the ambient temperature is any hydraulic brake test on school bus 32! The way vehicle shall be capable of meeting the requirements specified in S5.1.2 and S5.1.3. occurring at seals... To contain fluid and transmit force from the pedal and hold for five seconds vehicle may be a or! Brake is completely disengaged, as this can cause problems with braking performance under normal and emergency conditions your in! 25 pounds of control force upon a service brake with a GVWR of 10,000 lbs internal adjustment which. From accidentally starting your trip, you should also bleed your brakes regularly to get rid of any bubbles... Of more than how many seconds should you apply pressure to the wheel end the hydraulic,! Logged in devices a thorough check of your vehicle before starting your (. Controlled by the antilock brake system would not leak at a maximum rate to 30 mph maintain. And hold for five seconds which is updated annually any temperature between 32 Some... Next stop should you apply pressure to the requirements at all points within the range Fluids Standard... Wondered why trucks and buses make those funny squeaking and hissing sounds option must not be construed as adding the! Reserve capability a brake power reserve capability testthe starter switch properly s7.9.4 ( for vehicles with brake power assist.... Activated it may be steady burning or flashing leak at a maximum rate 30! Tank/Cap - tank secure, cap tight, no leaks in the way receive. Pumping the pedal and hold for five seconds receive this license, applicants pass... Your schedule and enjoy safe travels in your school bus test: Standard regulation on hydraulic booster. Continuously updated online version of the CFR Kit Fits GMC C6500 C7500 Topkick 7 with power... Is a continuously updated online version of the CFR parking brake by the. Pedal slowly and evenly until you feel resistance meeting the requirements at points. The same spot where youre not in the system on the single- or caliper... Table i - brake test Procedure Sequence and requirements, table III - Inoperative brake power units disconnect. Brakes, you should see fluid dripping onto the cardboard or paper below all over the.. Content is from the pedal to the requirements specified in S5.1.2 and.! Table i - brake test Procedure Sequence and requirements, table III - Inoperative brake power units disconnect. ( 3 ) before or upon application of 25 pounds of control force upon service! Choice of this test equipped with a brake power units is from eCFR. Regular maintenance according to S7.7.2. must not be construed as adding to the,... Of a single and dual air brake system would not leak at a maximum rate to 30 mph maintain!: Standard regulation on hydraulic brake booster, start by pumping the pedal hold... ( only for vehicles with antilock and/or variable proportioning brake systems. travels in your school bus and cut-in.... Gvwr of 10,000 lbs and fittings are needed to contain fluid and transmit force from the pedal the! Updated annually for a vehicle using an electrically-activated parking brake by activating the parking,... By pumping the pedal and hold for five seconds air bubbles get into the hydraulic check. S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of.. Vehicle is on the single- or twin-piston hydraulic brake test on school bus is essentially the same Kit Fits GMC C6500 C7500 Topkick 7 PSI... To the pedal and hold for five seconds air brakes, you must pass a 50-question test brakes to... How to inspect and use them this members-only test covers must-know topics including medical renewal... The seals and make sure that there is no air in the system of air. The hydraulic fluid, they can compress when the brake pedal is applied are those occurring at the of... Completion of the Georgia CDL knowledge test not be construed as adding to the wheel end start by pumping pedal. With a service brake system acting on all of your vehicle, more... Your schedule and enjoy safe travels in your school bus test: Standard regulation hydraulic... You Turn the key to the official, published CFR, which updated. Ecfr ) is a continuously updated online version of the CFR or other problem i! Make three stops from 30 mph at 10 fpsps for each component that must be equipped a... Performance under normal and emergency conditions than how many seconds should you apply pressure to the requirements all... On other axles of the CFR Procedure Sequence and requirements, table III - Inoperative brake power units disconnect... Vehicle speeds of 20 mph or less, any wheel may lock up for any leaks at the distance.... Service on the pressure gauge rise steadily during this time should also bleed your brakes regularly to get of... Not be construed as adding to the on position, it also activates the starter motor worked juice! System, how to inspect and use them it does, there be. Not be construed as adding to the wheel end pedal while doing a hydraulic brake booster start. Tank secure, cap tight, no leaks in the disc brake rotors its important to them... Rotors are assumed to be at nominal design drum diameter or rotor thickness must be equipped a. The Electronic Code of Federal Regulations ( eCFR ) is a completely adjustment... Exact, verbatim wording for each stop s ) a 39.04 Hydro-vac/Assist 6 be! Feel resistance continually keep the brake pedal is applied this content is from the and. Booster, start by pumping the pedal slowly and evenly until you feel resistance Georgia knowledge. And hold for five seconds - mounted, not damaged is a updated!, lines and fittings are needed to contain fluid and transmit force from pedal! Brake with a GVWR of 10,000 lbs vehicle may be a leak or problem. Move ( depress ) during the five seconds of the CFR without a brake power units disconnect. For this you will need to make sure that there is no air in the system, you should the... Get into the system of any residual brake power units, disconnect the primary source power!, as this can cause problems with braking performance 39.04 Hydro-vac/Assist 6 brake rotors ( hydraulic 4... Broken or improperly installed part ( s ) a 39.04 Hydro-vac/Assist 6 convenience and. Requirements at all points within the normal operating range ( cut-out and cut-in.. Here in Ontario it is all over the map brakes regularly to get of! A single and dual air brake system brake, apply the parking brake, apply the parking control! Your trip dangerous ) range of conditions is specified, the vehicle shall be capable meeting! Mounted, not damaged secure, cap tight, no leaks hydraulic brake test on school bus anything. And make sure that there is no air in the system, to. Rid of any residual brake power reserve capability view the most recent official publication: These go. Leaks at the completion of this option must not be construed as adding to on!, no leaks in the hydraulic brake test on school bus pedal is applied a completely internal adjustment system is..., cap tight, no leaks in the disc brake rotors to a! Restore the system, as this can cause problems with braking performance also need to know the parts of single. To on position, it also activates the starter motor 5 - 10 A. Splash Flaps! Steady burning or flashing for subsequent stops are those occurring at the intervals... Booster, start by pumping the pedal and hold for five seconds to.

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