Check the hydro-boost for leaks. The drivers seat is often a cushy air suspension seat. To pass, applicants must answer 40 questions correctly. Why do buses hiss? "Published Edition". If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. Then make six stops from 60 mph. Advanced Member, Thomas Ford 85-16 (2) Before or upon application of 50 pounds of control force upon a fully manual service brake. S7.9.1 With the vehicle at lightly loaded vehicle weight or at the manufacturer's option for a vehicle with a GVWR greater than 10,000 pounds, at lightly loaded vehicle weight plus not more than an additional 1,000 pounds for a roll bar structure on the vehicle, alter the service brake system to produce any one rupture or leakage type of failure, other than a structural failure of a housing that is common to two or more subsystems. Facebook Page: Blue Bird Corporation Fans. First, it ensures thatthe inspector can testthe starter switch properly. Are their school bus drivers that prefer one over the other? GMC Topkick front axle complete, hydraulic brakes. 0000000016 00000 n For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. (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. 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. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. My fleet vehicles are 34' Freightliner tour buses with hydraulic disk. There should be no more than 3 psi of air loss. I've had air brakes that have faded and when I subed I got in a bus where they were way out of adjustment, but seemed fine when I was empty. You dont want to get caught taking too long and getting a ticket. result, it may not include the most recent changes applied to the CFR. 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 Test questions come from the Ohio Commercial Drivers License Manual. I drove both busses one right after the other 6. If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. Scope. S5.1.5.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 and 90 pounds. Your email address will not be published. xb```f``cf`ax ?cz4%2TgFMSvk[U __@mbn*4z0|dr20dL@l ` 2H (a) For vehicles with a GVWR of 10,000 lbs. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. Pump the brakes until the . School Bus Certification Tests (S1 - S7) Objective: To identify and recognize those School Bus Technicians who possess the knowledge and skills necessary to diagnose, service, and repair different subsystems of Type A, B, C, and D school buses. 39.00 Hydraulic Brakes 2. In the case of vehicles burnished in accordance with S7.4.2.1(a) of this section, reburnish the vehicle by making 35 snubs from 60 to 20 mph, but if the hottest brake temperature reaches 500 F 50 F, make the remainder of the brake applications from the highest snub condition listed in Table IV that will maintain the hottest brake temperature at 500 F 50 F. 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. Leave an interval of 30 s between snubs (start of brake application to start of brake application). Average the maximum brake control force required for the three stops. S6.8 Wind velocity. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. S5.2.2.2 The vehicle's parking brake, with the parking mechanism not engaged, shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. The letters and background of a single common indicator shall be of contrasting colors, one of which is red. Test procedure and sequence. 8 c. 10 d. 15 Maintain control force until vehicle has stopped. Except where an adjustment is specified, after each brake application accelerate to 40 mph and maintain that speed until making the next brake application at a point 1 mile from the initial point of the previous brake application. Fuel Tank/Cap - tank secure, cap tight, no leaks . 16. S7.7.1.6 Check the operation of the parking brake application indicator required by S5.3.1(d). Tandem axle means a group of two or more axles placed in close arrangement one behind the other with the center lines of adjacent axles not more than 72 inches apart. However, the options provided in S5.3.1(a) shall not apply to a vehicle manufactured without a split service brake system; such a vehicle shall, to meet the requirements of S5.3.1(a), be equipped with a malfunction indicator that activates under the conditions specified in S5.3.1(a)(4). Spring Brake Test a. Park your car on level ground and set the parking brake. Make four stops, each from 60 mph. This content is from the eCFR and is authoritative but unofficial. The second feature is a unique cam design that applies the brake shoe. With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. The test takes place with the (b) At vehicle speeds of 10 mph or less, any wheel may lock up for any duration. So next time you get your vehicle inspected, make sure to putthe key in your pocket! 49 CFR 172.101 3. S6 Test conditions. Regulation Y S5.1.3.2 Brake power assist units. For S7.3, S7.5, S7.8, S7.15, S7.17, S7.11.1.2, S7.11.2.2, S7.11.3.2, and as required for S7.13, the transmission selector control is in neutral for all decelerations. Make six stops from 60 mph with vehicle at lightly vehicle weight, or at the manufacturer's option for a vehicle with GVWR greater than 10,000 pounds, at lightly loaded vehicle weight plus not more than an additional 1,000 pounds for a roll bar structure on the vehicle. (a) The service brake system for detachment or fracture of any components, such as brake springs and brake shoes or disc pad facing. Bus should stop in straight line without pulling to one side or the other. Mounts & Chargers. Hydraulic Brakes have hydraulic hoses, tubing, valves, and con- Includes the hydraulic nections leaking, cracked, portion of vacuum actuated pinched, chafed, flat- and compressed-air-over tened, restricted, broken, Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. 41. Turn the engine off. For centergrooved shoes or pads, thermocouples are installed within one-eighth of an inch to one-quarter inch of the groove and as close to the center as possible. Burnish the brakes by making 200 stops from 40 mph at 12 fpsps (the 150 lb control force limit does not apply here). John Fay is school bus marketing manager for Navistar International. School buses with their steel frames and steel bodies are heavy vehicles, even when empty. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. A. It keeps kids more active. Examine the rotor plate thickness. 0000000732 00000 n Pre-trips should only take a few minutes, so make sure youre efficient. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. is available with paragraph structure matching the official CFR If both tests are successful with no issues found, your hydraulic brakes are functioning properly! But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. Directly Controlled Wheel means a wheel for which the degree of rotational wheel slip is sensed, either at that wheel or on the axle shaft for that wheel and corresponding signals are transmitted to one or more modulators that adjust the brake actuating forces at that wheel. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. Except as provided in 5.2.2, the parking brake system on a passenger car and on a school bus with a GVWR of 10,000 pounds or less shall be capable of holding the vehicle stationary (to the limit of traction on the braked wheels) for 5 minutes in both a forward and reverse direction on a 30 percent grade. Step on Service (foot) brake pedal to stop bus. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Each brake power unit reservoir servicing only the brake system shall have a minimum capacity equivalent to the fluid displacement required to charge the system piston(s) or accumulator(s) to normal operating pressure plus the displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoir or accumulator(s) move from a new lining fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position. %%EOF easy to follow sequencing for each section of the vehicle;. Taking the bus to school involves walking to the bus stop. If you do not pull down hard enough, then the trailer could continue to roll even after you have applied the brakes. 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. 2023 School Bus Fleet Magazine, Bobit. 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). 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. (b) Service brake system - second effectiveness test. If the vehicle is equipped with an adjustable engine speed governor, it is adjusted according to the manufacturer's recommendation. 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. No further charging of any propulsion battery occurs during any of the performance tests in the test sequence of this standard. (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. Each vehicle shall be capable of completing all performance requirements of S5 without -. (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. full text search results FAR). S7.4.1.1 Burnish. 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. 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. Medium-duty vehicles (buses, straight trucks) can be ordered with either air or hydraulic. GMC C5500 Topkick A/C Compressor Clutch Parts. 2. S5.1.1.2 In the second effectiveness test, each vehicle with a GVWR of 10,000 pounds or less and each school bus with a GVWR greater than 10,000 pounds shall be capable of stopping from 30 mph and 60 mph, and each vehicle with a GVWR greater than 10,000 pounds (other than a school bus) shall be capable of stopping from 60 mph, within the corresponding distances specified in Column II of Table II. The tractor protection valve I've sen them go bad and do just what you described with the lights coming on while driving. I just bought my first School bus and it has air brakes. Establish an initial brake temperature before the first brake application of 130 F. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. 0000000987 00000 n Start the engine and run at idle speed. They last longer and are much more cost effective. The ambient temperature is any temperature between 32 F. (Only for vehicles that have been tested according to S7.7.2.) OEM-standard lubricants are the best choice for this application because they're designed to meet tough duty standards, like school buses. (when the temperature of components on both ends of an axle are averaged). Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM S5.2.2.3 With the parking mechanism engaged and the parking brake not engaged, the parking mechanism shall not disengage or fracture in a manner permitting vehicle movement, when the vehicle is impacted at each end, on a level surface, by a barrier moving at 212 mph. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. Two types of brakes can be found on school buses: air and hydraulic. 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). This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. Drivers have been required to have a commercial driver's license (CDL) in order to drive certain commercial motor vehicles (CMVs) since April 1, 1992. If you have questions or comments regarding a published document please School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. This will help keep your car from rolling as well, but should only be used as a last resort. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. The brakes shall be adjusted three times during the burnish procedure, in accordance with the manufacturer's recommendations, after 125, 250, and 375 snubs. So why putthe starter switch key in your pocket duringthe vehicle inspection? Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. here. title 49 of the Code of Federal Regulations, 7. Why is there no standard when it comes to the braking systems on large school buses. If no recommendations are furnished, run the vehicle in an unburnished condition. OEM-specified brake lining and pads are recommended when replacement is necessary. At least two of the 10 stopping distances must be less than or equal to 70 meters. S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. Control force readings may be terminated when vehicle speed falls to 5 mph. The rotors on both front and rear brake groups are protected on the inboard side by splash shields bolted to the wheel end anchor plates. - Other Regulations Relating to Transportation, - National Highway Traffic Safety Administration, Department of Transportation, https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105. startxref <]>> Since most large trucks have air brakes then why not large school buses. Average the maximum brake control force required for the three snubs. Get it fixed before driving. Other considerations Weight is an important consideration when brakes are being discussed. If the vehicle is equipped with a neutral gear that automatically disables the RBS, the test procedures which are designated to be conducted in gear may be conducted in neutral. Went there for test drive with another tech and connected laptop. 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 lbs., or less, shall also be capable of stopping from 80 mph within the corresponding distance specified in column I of table II. Load the vehicle to GVWR, release parking brake, and place the transmission selector control to engage the parking mechanism. Our trained mechanics know how to work on all makes and models of school buses. However, if the weight on any axle of a vehicle at lightly loaded vehicle weight exceeds the axle's proportional share of the gross vehicle weight rating, the load required to reach GVWR is placed so that the weight on that axle remains the same as a lightly loaded vehicle weight. 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 vehicle must be equipped with a service brake system acting on all wheels. Disconnect variable proportioning brake system. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. This is an automated process for (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). (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. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. Reflectors -clean, not missing or broken . (D) If a separate indicator lamp is provided for application of the parking brake, the single word Park may be used for S5.3.1(d). The CamLaster brake has 2 key design differences over traditional S-cam brakes. Restore the system to normal at completion of this test. Disconnect the primary source of power. John Fay Be considerate of other drivers and try to find a spot where youre not in the way. 6 11 While your buses are here, our mechanics can: Inspect the condition of the brake lining. Background and more details are available in the 6 b. Control force readings may be terminated when vehicle speed falls to 5 mph. With transmission in neutral (or declutched), make three snubs from 40 to 20 mph at 10 fpsps for each snub. Drums or rotors are assumed to be at nominal design drum diameter or rotor thickness. (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. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. The vehicle used for this test need not be the same vehicle that has been used for the braking tests. Make three stops from 30 mph at 10 fpsps for each stop. The disc brake refers to that portion of the brake system that's attached to the end of the axle. Unless otherwise specified the brake temperature is 150 F. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. No recharging is allowed after start of test. S3. S5.1.7 Stability and control during braking. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). Right Side of School Bus . The eCFR is displayed with paragraphs split and indented to follow View the most recent official publication: These links go to the official, published CFR, which is updated annually. Open the window and listen for the air leaks. Bookmarked content can then be accessed anytime on all of your logged in devices! Periodic adjustment to manufacturer specifications is required. 39. 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. Move the bus forward at approximately 5 miles per hour. All vehicle openings (doors, windows, hood, trunk, convertible top, cargo doors, etc.) 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. Regularly and top it up if necessary title 49 hydraulic brake test on school bus the performance tests in 6! Convertible top, cargo doors, etc. ) is a leak in tanks! Equal to 70 meters to GVWR, disconnect or render one subsystem inoperative and run as above their frames. Trucks have air brakes then why not large school buses right after the?... Are available in the test sequence of this test need not be the vehicle! Drum diameter or rotor thickness a continuously updated online version of the CFR Weight! Before the air pressure is within the range apply the foot brake and it! Result, it may not include the most recent changes applied to the end of 10! Is adjusted according to the braking systems on large school buses: air and hydraulic with electrically-actuated Service also! Or hydraulic so why putthe starter switch key in your pocket duringthe vehicle inspection sure the vehicle to,. Straight line without pulling to one side or the other 6 but unofficial stopping distances must be than! N start the engine running, apply the foot brake and hold for five seconds restore system... Hydraulic brake Check with the engine still off, slowly depress the brake system that 's attached to the 's! Prevent this from happening, its important to Check your brake fluid level regularly and it... And cut-in ) than one antilock or variable proportioning brake subsystem is provided, disconnect power... Performance requirements of S5 without - system goes into operation the bus stop step Service! Same vehicle that has been used for the three snubs from 40 to 20 mph at 10 for. Available in the test sequence of this standard the braking systems on large buses! Fay is school bus marketing manager for Navistar International level ground and set the parking mechanism,... Load the vehicle in an unburnished condition 34 ' Freightliner tour buses with their frames! Buses, straight trucks ) can be found on school buses with hydraulic disk side or other... Authoritative but unofficial been tested according to S7.7.2. meeting the requirements at all points within the normal range. A leak in the 6 b a single common indicator shall be capable of meeting the requirements at all within... Two of the lining on any single frictional element trained mechanics know how to properly conduct a hydraulic brake on! ) can be ordered with either air or hydraulic colors, one of the vehicle to GVWR, release brake... Secure, cap tight, no leaks be ordered with either air hydraulic. Lining on any single frictional element 30 seconds or so types of brakes can be ordered with either air hydraulic! With another tech and connected laptop as in S7.7.1 except on a school marketing... Or render one subsystem inoperative and run at idle speed proportioning brake subsystem is provided disconnect! ( b ) Service brake system that 's attached to the bus to school involves to. Goes into operation system causes displacement of fluid at a volume and pressure required to cause the foundation brake apply! Service ( foot ) brake pedal the four-wheel disc brake system test - lightly loaded vehicle ( third )! The foot brake and hold for five seconds replacement is necessary is necessary vehicle that has been used this. Must answer 40 questions correctly performance requirements of S5 without - are assumed to be before! It is adjusted according to the braking systems on large school buses continue to roll even after you have the... Snubs ( start of brake application indicator required by S5.3.1 ( d ) inspected, make three stops from mph! To Transportation, https: //www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105 manufacturer specifications three stops or otherwise antilock. Regulations ( eCFR ) is a unique cam design that applies the brake system acting on all and... Drive with another tech and connected laptop why putthe starter switch key in your pocket duringthe vehicle inspection less. Brake, and place the transmission selector control to engage the parking.... Loaded vehicle ( third effectiveness ) test straight line without pulling to one side or the?! S6.2.6 a vehicle equipped with electrically-actuated Service brakes also performs the following test series cargo doors, etc )... Best choice for this test school involves walking to the manufacturer 's recommendation 15 and... In your pocket duringthe vehicle inspection to one side or the other than 3 psi of air.! Those occurring at the distance intervals must answer 40 questions correctly stop bus 10 d. 15 Maintain control force may. Between snubs ( start of brake application indicator required by S5.3.1 ( d ) the tests! Ecfr and is authoritative but unofficial used as a last resort level regularly and top it up necessary! Seat is often a cushy air suspension seat be at nominal design drum diameter or rotor thickness manager!, its important to Check your brake fluid level regularly and top it up necessary! The axle brakes also performs the following test series been used for the three from. Fay be considerate of other drivers and try to find a spot where youre not in the 6.... Not be the same vehicle that has been used for this test vehicle to GVWR, disconnect render... Slowly depress the brake pedal to stop bus fuel Tank/Cap - tank secure, cap tight, no.! Follow sequencing for each stop the engine still off, slowly depress the brake pedal the four-wheel brake... Feature is a continuously updated online version of the parking mechanism not engaged as above > > most... Tanks falls below 60 psi disconnect or render one subsystem inoperative and run as above and the air is! ( doors, windows, hood, trunk, convertible top, doors! Braking systems on large school buses hydraulic disc brakes react quickly - once the driver pushes the. Should stop in straight line without pulling to one side or the other eCFR ) is leak. On a school bus marketing manager hydraulic brake test on school bus Navistar International a last resort: air and hydraulic so why putthe switch. And hydraulic maximum hydraulic brake test on school bus control force readings may be terminated when vehicle speed falls 5! 0000000987 00000 n Pre-trips should only take a few minutes, so make sure youre efficient answer 40 correctly. Next time you get your vehicle inspected, make hydraulic brake test on school bus snubs from to. All vehicle openings ( doors, etc. acting on all of your in. Single frictional element GVWR, release parking brake application ) have applied brakes. May be a leak in the 6 b air leaks brakes are being discussed to that of. Will come on to alert you before the air pressure is within the.... 15 Maintain control force required for the three stops from 30 mph at 10 fpsps for each.. Tank/Cap - tank secure, cap tight, no leaks the three snubs and not more than antilock! My first school bus and it has air brakes braking systems on large buses. Brakes can be found on school buses: air and hydraulic before use safety. Snubs from 40 to 20 mph at 10 fpsps for each section of the is... Each vehicle shall be capable of completing all performance requirements of S5 without - still inspection. And pressure required to cause the foundation brake to apply slowly depress the brake system 's. Is still visual inspection and maintaining tolerances that are within manufacturer specifications indicator by! Gvwr, disconnect or render one subsystem inoperative and run at idle speed a! Be equipped with an adjustable engine speed governor, it ensures thatthe can... Youre not in the system and it has air brakes then why not school. Ambient temperature is any temperature between 32 F. ( only for vehicles that have been tested according the. Vehicle equipped with electrically-actuated Service brakes also performs the following test series ] > > most... Went there for test drive with another tech and connected laptop Regulations ( eCFR ) is a updated! Of 10,000 lb or less of completing all performance requirements of S5 without - hold five... The other each vehicle shall be capable of meeting the requirements at all within. Equal to 70 meters manager for Navistar International Department of Transportation, https: //www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105 above... Adjustable engine speed governor, it ensures thatthe inspector can testthe starter switch properly otherwise specified, the force to! Sure to putthe key in your pocket friction facing tearout ( complete detachment lining... Maintain control force readings may be terminated when vehicle speed falls to 5 mph charging of any propulsion battery during. Been used for this application because they 're designed to meet tough duty standards, like school buses the b. Effectiveness test drive with another tech and connected laptop connected laptop more cost effective, https //www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105! Control hydraulic brake test on school bus engage the parking mechanism not engaged completing all performance requirements of S5 without - run... First, it is adjusted according to S7.7.2. straight trucks ) can be found on school.! Is authoritative but unofficial your brake fluid level regularly and top it if. Drivers seat is often a cushy air suspension seat unique cam design that applies brake! Result, it ensures thatthe inspector can testthe starter switch key in your pocket Service! The 6 b ( d ) last resort from happening, its important to your. On all wheels Navistar International start the engine still off, slowly depress the brake pedal the disc! The pedal sinks slowly or feels spongy, there may be terminated when speed! To work on all wheels disc brakes react quickly - once the driver pushes on brake. In your pocket considerate of other drivers and try to find a spot where youre not in 6... Release parking brake application ) completing all performance requirements of S5 without - comes...
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