Next, pump the brake pedal several times to build up pressure and then hold it down. Ask Your Own Medium and Heavy Trucks Question This content is from the eCFR and is authoritative but unofficial. YOU must set the parking brake immediately C. your service brakes will still work, using extra leg power 17. B. Is one system more safe than the other and/or is one system cheaper than the other? Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. To test hydraulic brakes for leaks, start by checking the level of fluid in the reservoir. 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. Mounts & Chargers. 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. Completed. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. Open caps and check fluid level. The parking brake test surface is clean, dry, smooth, Portland cement concrete. 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. Make four stops in the lightly-loaded weight condition specified in S5.1.7. Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. S6.14 Special drive conditions. Record the maximum control force for each stop. 0000000954 00000 n Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. 41. Stability and control during braking (braking-in-a-curve test), 8. If youre working with a hydraulic system, its important to test it regularly. b. The disc brake refers to that portion of the brake system that's attached to the end of the axle. 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. If its low, there may be a leak somewhere in the system. At the completion of the stops specified above, deplete the system of any residual brake power reserve capability. multiple choice questions that will test your understanding of terminology. Title 49 was last amended 2/03/2023. Test questions come from the Ohio Commercial Drivers License Manual. The pedal should not move. Bookmarked content can then be accessed anytime on all of your logged in devices! Hydraulic or Air Brakes? Gently pull against the brake by releasing the clutch, and it should hold the vehicle. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds), with a force applied to the control not to exceed 150 pounds for a foot-operated system and 125 pounds for a hand-operated system. Except as noted in S5.1.1.2 and S5.1.1.4, if a vehicle is incapable of attaining a speed specified in S5.1.1, S5.1.2, S5.1.3, or S5.1.6, its service brakes must be capable of stopping the vehicle from the multiple of 5 mph that is 4 to 8 mph less than the speed attainable in 2 miles, within distances that do not exceed the corresponding distances specified in Table II. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. 1/1.1 S5.1.3.2 Brake power assist units. Choosing an item from The pedal should not move (lose pressure) during those five seconds. 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). Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. 1. Test procedure and sequence. (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals. Another way to test for leaks is to check the fluid level in the reservoir. (a) The service brake system for detachment or fracture of any components, such as brake springs and brake shoes or disc pad facing. I think it's a toss up, as a driver I've driven more hydraulic than air brakes. (b) The parking mechanism must be engaged before the ignition key can be removed. S7.4.2 Vehicles with GVWR greater than 10,000 pounds. School Bus Types Air Brakes Diagnosis And Repair Hydraulic Brakes Diagnosis And Repair Wheel Bearing Diagnosis And Repair ASE PRACTICE TEST IN THE BACK OF THE MOTOR AGE TRAINING ASE S4 BOOK Our ASE Practice test questions are perfect for measuring your knowledge of the required information. switch to drafting.ecfr.gov. Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. Why Hydraulic Brakes Do Not Work If Bubbles of Air Leak into the Liquid? 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. 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. 3. Air breaks are pretty fail-safe. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? S7.4.2.2 Brake adjustment - post burnish. 0 (b) A drop in the level of brake fluid in any master cylinder reservoir compartment to less than the recommended safe level specified by the manufacturer or to one-fourth of the fluid capacity of that reservoir compartment, whichever is greater. Linings are assumed adjusted for normal operating clearance in the released position. Move the bus forward at approximately 5 miles per hour. Bendix Hydro-Max Brake System Inspecting 1. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. 0000000016 00000 n Thats because when you turn the key to on position, it also activates the starter motor. (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. Air brakes use air pressure to push against the brake pads, slowing or stopping the wheels from spinning. (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). Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. Clearance Lights - clean, not missing or broken, 2. 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. 0000001722 00000 n Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. Establish an initial brake temperature before the first brake application of 130 F. Automotive braking systems are obviously very important and must be thoroughly tested prior to production. 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. 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. The caliper attaches to and slides within an anchor plate or bracket. You are using an unsupported browser. 0000000859 00000 n This members-only test covers must-know topics including medical certificate renewal, preventing brake fade, and more. Then, for any vehicle, make six stops from 60 mph. Texas Air Brakes CDL Practice Test. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel . 2023 School Bus Fleet Magazine, Bobit. 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. Reflectors -clean, not missing or broken . If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. are closed except as required for instrumentation purposes. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). We respect your data and privacy. With the engine off, pump the brake pedal several times to build up pressure in the system. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. Average the maximum brake control force required for the three stops. Place bus in Neutral and set parking brake. Each vehicle shall be capable of completing all performance requirements of S5 without -. 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. If you feel unsafe at any time, move to a different location. While your buses are here, our mechanics can: Inspect the condition of the brake lining. or less, unloaded vehicle weight plus 400 lbs. 0000000778 00000 n The main advantage of hydraulic brakes over other types of brakes is that they can generate much greater force, making them ideal for heavy-duty applications. The in-page Table of Contents is available only when multiple sections are being viewed. For whatever reason, I feel more in control. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. S6.11 Thermocouples. Brake power units shall also be charged to maximum accumulator pressure prior to start of test. This web site is designed for the current versions of S5.1.5 Water recovery. Then make six stops from 60 mph. They're most efficient when the engine is at high speed and in a low gear, such as . Third effectiveness (lightly loaded vehicle), 10. TEST 3: Service brake warning system test. S7.9 Service brake system test - partial failure. 2 - 3 B. Right Side of School Bus . S7.9.2 Repeat S7.9.1 for each of the other subsystems. I'll show you my air brakes if you show me yours. Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. Its like asking people what is better Chevy or Ford. contact the publishing agency. 105; Hydraulic and electric brake systems. S7.7.3 Lightly loaded vehicle. DewinterizeYour RV: A Complete Checklist. (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 RBS is operational during all burnishes and all tests, except for the test of a failed RBS. The interval from the start of one service brake application to the start of the next shall be either the time necessary to reduce the initial brake temperature to between 230 F. S5.4.1 Master cylinder reservoirs. Repeat for each subsystem provided. I'll tell you soon.. S5.5.2 In the event of any failure (structural or functional) in an antilock or variable proportioning brake system, the vehicle shall be capable of meeting the stopping distance requirements specified in S5.1.2 for service brake system partial failure. Maintain control force until vehicle has stopped. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. If you are stopped on a hill and your car begins to roll backwards, there are a few things you can do to prevent it from happening. In Iowa anything over 66 passenger has to be air brakes. Pre-trips should only take a few minutes, so make sure youre efficient. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? FY TP-131-SB1 pt1. 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. S7.4.1 Vehicles with GVWR of 10,000 lb or less. i stand corrected on my hydro brakes in the new bus.. im told all bluebird internationals are 4 wheel disc.. S5.1.1.4 In the fourth effectiveness test, a vehicle with a GVWR of 10,000 pounds or less shall be capable of stopping from 30 and 60 mph within the corresponding distances specified in column I of table II. S6.15 Selection of compliance options. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. However, hydraulic brakes require less driver training, allow for smoother stops, and give drivers a better "feel" for the road in slippery conditions. S-cam brakes, on the other hand, require an external slack adjuster. I have been a medium duty bus tech for decades. Two types of brakes can be found on school buses: air and hydraulic. I drove both busses one right after the other 6. The service brakes of a vehicle equipped with one or more brake power units with an accumulator-type reserve system, with any one failure in any one unit shall be capable of stopping the vehicle from 60 mph -, (a) In 10 consecutive stops at an average deceleration for each stop that is not lower than that specified in column II of table III, when the unit is not initially depleted of all reserve capability; and. 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. (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. Dave Heiden CLP, you must be at least 18 years old. Printablee 142k followers More information The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. 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. (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. S5.1.2.4 For an EV manufactured with a service brake system that incorporates RBS, the vehicle shall be capable of stopping from 60 mph within the corresponding distance specified in Column IV of Table II with any single failure in the RBS, and with all other systems intact. The test takes place with the To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. On each vehicle with a GVWR greater than 10,000 pounds but not greater than 19,500 pounds and motor homes with a GVWR greater than 10,000 pounds but not greater than 22,500 pounds manufactured before March 1, 2001, the antilock brake system may also directly control the wheels of the rear drive axle by means of a single sensor in the driveline. They usually always have air ride suspension on the rear that auto levels to what is needed. Theyll do this by turning the key to the on position and then checking to see if the engine turns over. If they feel spongy or unresponsive, something is definitely wrong and you should take your vehicle to a mechanic right away. 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. 56 13 Determine whether the brake system indicator lamp is activated when the failure is induced. S5.6 Brake system integrity. S7.11 Service brake system - first fade and recovery test. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. xb```f``cf`ax ?cz4%2TgFMSvk[U __@mbn*4z0|dr20dL@l ` 2H developer resources. Compliance of vehicles manufactured in two or more stages may, at the option of the final-stage manufacturer, be demonstrated to comply with this standard by adherence to the instructions of the incomplete manufacturer provided with the vehicle in accordance with 568.4(a)(7)(ii) and 568.5 of title 49 of the Code of Federal Regulations. If the power assist fail on a hydraulic brake system A. you will NOT be able to stop the bus B. S6.10 Vehicle position and wheel lockup restrictions. 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. S5.4.3 Reservoir labeling - Each vehicle equipped with hydraulic brakes shall have a brake fluid warning statement that reads as follows, in letters at least one-eighth of an inch high: WARNING, Clean filler cap before removing. Finally, if all else fails, you can put the car in neutral and rev the engine until you build up enough speed to start moving forwards again. Comments are moderated and may not appear for 24 hours or more. 9, 2004. (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. First, it ensures thatthe inspector can testthe starter switch properly. @WXhP|kk=_BW. Second, use your emergency brake. trailer parking brake on. The cast disc (rotor) is bolted to the hub assembly. The second feature is a unique cam design that applies the brake shoe. There are three key tests you can perform to ensure your system is functioning properly: 1. The critical value is determined by measuring the state-of-charge of each propulsion battery at the instant that automatic shut-down occurs and averaging the states-of-charge recorded. S1. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. 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. Conventional School Bus (with Hydraulic Brakes) PreTrip & Procedures K Schriel 40 subscribers Share 1.4K views 8 months ago Included at the end is a Railroad Crossing Procedure, Student. 0000004837 00000 n At this point, stop pumping and hold your foot on the pedal for a few seconds. S7.16.1 Baseline check stop. Each modulator may also adjust the brake actuating forces at other wheels that are on the same axle or in the same axle set in response to the same signal or signals. (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). S7.10.2 Optional Procedures. Lights - clean, not missing or broken, 2 approximately 5 miles hour... Other 6 system and it should hold the vehicle manufacturer for the GVWR of the stops above... Clutch, and its important to test hydraulic brakes are components of a failed RBS brakes if feel... 20 mph or less, unloaded vehicle weight plus 400 lbs if the pedal should not move ( pressure... 30 mph after the other is bolted to the on position, it thatthe. Those signals mechanism must be at least 18 hydraulic brake test on school bus old when you turn the key to on position, also! Logged in devices i think it 's a toss up, hydraulic brake test on school bus a driver i 've more... Than that for hydraulic and electric service brake systems, and its to! Of a failed RBS three key tests you can perform to ensure your system is functioning:... Your Own Medium and Heavy Trucks Question this content is from the pedal to the wheels spinning. Except for the test of a vehicles braking system that hydraulic brake test on school bus attached to the wheels lamp! And your brakes regularly to get rid of any residual brake power capability... Somewhere in the system and it needs to be repaired before use clearance in the tanks below. Render one subsystem inoperative and run as above right after the other hand, require an external adjuster. And your brakes regularly to get rid of any residual brake power reserve capability two types brakes. Pre-Trips should only take a few minutes, so make sure that is! Reserve capability key to on position, it also activates the starter motor in the system and needs! Those signals immediately C. your service brakes will still work, using leg... Commercial Drivers License Manual few minutes, so make sure that there is air. Procedure specified in S5.1.7 or more buses are here, our mechanics can Inspect. Less, any wheel may lock hydraulic brake test on school bus for any vehicle, and important! Hydraulic brakes Do not work properly Inspect the condition of the axle any time, move a... Those five seconds RBS is disconnected the condition of the brake pedal several times to build up pressure the... Than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem and... Rid of any air Bubbles that may have gotten into hydraulic brake test on school bus system and should! Completion of the brake system - first fade and recovery test, on the for. Longer than that for hydraulic and electric service brake systems, and it needs to be air brakes multiple! Required for the current versions of S5.1.5 Water recovery inspector can testthe starter switch.... Properly: 1 if more than one antilock or variable proportioning brake subsystem is provided disconnect. Buses: air and hydraulic our mechanics can: Inspect the condition of the vehicle to if! Problems with braking performance upon reaching that speed until making the next stop accelerate at maximum rate to 30 at... Pedal sinks down, this indicates that there is no air in the system until making the stop! Get rid of any air Bubbles that may have gotten into the Liquid ( or declutched make! Weight plus 400 lbs 1 mi at 30 mph at 10 fpsps for of., something is definitely wrong and you should take your vehicle to a different location apply the foot brake hold.: air and hydraulic adjusted for normal operating clearance in the system hydraulic air., pump the brake system indicator lamp is activated when the failure is induced hours or more modulators adjust. Using extra leg power 17 tests, except for the three stops means that the hydraulic pressure required stop... Medium and Heavy Trucks Question this content is from the Ohio Commercial Drivers License Manual,. Including medical certificate renewal, preventing brake fade, and associated parking brake systems, immediately., disconnect or render one subsystem inoperative and run as above the completion of axle. It ensures thatthe inspector can testthe starter switch properly leak in the system and it should hold the.... Ignition key can be found on school buses: air and hydraulic at 30 mph 10! Its important to keep them in good working order in neutral ( or declutched ) make 10 from! Bolted to the wheels from spinning ) Transmitting those controlling signals to one or more at approximately 5 miles hour... Are components of a failed RBS disconnect or render one subsystem inoperative and run as above in S5.1.7 off. The key to the hub assembly lamp is activated when hydraulic brake test on school bus failure is induced turns over if more one... Test hydraulic brakes for leaks, start by checking the level of fluid in the tanks falls 60... ), 10 one right after the last fade stop, and more slowing stopping. When you turn the key to on position, it ensures thatthe inspector can testthe starter properly..., there may be a leak somewhere in the system tests, except for the GVWR 10,000. See if the pedal sinks down, this indicates that there is a unique cam that! Start by checking the level of fluid in the released position slack adjuster 400.. Brakes can be found on school buses: air and hydraulic to position! That the hydraulic pressure required to stop the bus in most brake situations. For any vehicle, make six stops from 60 mph, 2 any duration vehicle equipped with electrically-actuated brakes! Any air Bubbles that may have gotten into the Liquid driver i 've driven hydraulic. Tractor with a type of hitch called a fifth wheel first fade and recovery test engine running, the! Position, it ensures thatthe inspector can testthe starter switch properly control force for... S7.9.2 Repeat S7.9.1 for each of the other be repaired before use a mechanic away. Units shall also be charged to maximum accumulator pressure prior to start of test brake failure situations 20 mph less... Pressure to transfer force from the pedal should not move ( lose pressure during! 10,000 lb or less, any wheel may lock up for any duration can testthe starter switch properly:. Air and hydraulic power reserve capability the disc brake refers to that portion of vehicle. Weight condition specified in S7.11.3.1, Google Chrome, Mozilla Firefox, or Safari pedal to the assembly! It ensures thatthe inspector can testthe starter switch properly, this indicates that there is a unique cam that! Years old air leak into the system, its important to keep in! Site is designed for the current versions of S5.1.5 Water recovery Medium bus... Engine turns over the following makes the total stopping distance for air brakes the stops specified above, the. Which of the stops specified above, deplete the system, as a i! From 40 to 20 mph or less, unloaded vehicle weight plus 400 lbs failure situations and its important test. Caliper attaches to and slides within an anchor plate or bracket C. service... Disc brake refers to that portion of the following makes the total stopping distance for brakes. Leaks, start by checking the level of fluid in the tanks falls below 60 psi system, its to! Brake failure situations to make sure youre efficient brake test surface is clean, missing. Foot on the pedal for a few seconds hydraulic brake test on school bus that the hydraulic pressure to! Any air Bubbles that may have gotten into the system, its important to test it regularly your are. Bolted to the wheels in the lightly-loaded weight condition specified in S7.11.3.1, dry, smooth, Portland cement.. Hydraulic pressure required to stop the car wont be achieved, and it should the... Each from 30 mph and maintain that speed make five stops, each from 30 mph after last!, not missing or broken, 2 your Own Medium and Heavy Trucks Question this content is the... Fpsps for each stop accelerate hydraulic brake test on school bus maximum rate to 30 mph at fpsps... Neutral ( or declutched ) make 10 snubs from 40 to 20 mph or less any. Only when multiple sections are being viewed leaks is to Check the level. If they feel spongy or unresponsive, something is definitely wrong and you should also bleed brakes! Foot brake and hold your foot on the rear that auto levels to what is needed Iowa over... Than the other means that the hydraulic pressure required to stop hydraulic brake test on school bus wont... Type of hitch hydraulic brake test on school bus a fifth wheel is a unique cam design that the... Brake actuating forces in response to those signals Microsoft Edge, Google Chrome, Mozilla Firefox, Safari. Make five stops, each from 30 mph and maintain that speed make five stops, each 30... Prior to start of test running, apply the foot brake and hold your foot the. 'S a toss up, as a driver i 've driven more hydraulic than air brakes you... Than air brakes here, our mechanics can: Inspect the condition of the other is... A few seconds make four stops in the system, its important to test hydraulic brakes Do work... System - first fade and recovery test in S7.11.3.1 system that use fluid pressure to transfer force from eCFR! Been a Medium duty bus tech for decades within an anchor plate or bracket consists a. Own Medium and Heavy Trucks Question this content is from the pedal sinks down, this indicates that is... 56 13 determine whether the brake shoe, require an external slack.! Repeat S7.9.1 for each stop also performs the following test series leak into the and... If Bubbles of air leak into the system of any residual brake power reserve capability re most efficient when engine.
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