hydraulic brake test on school bus

If it does, theyll know that the starter switch is working properly. Heres how to do a basic check: Start by checking the fluid level in the reservoir. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Reservoirs, whether for master cylinders or other type systems, shall have a total minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position, as determined in accordance with S7.18(c) of this standard. will bring you to those results. Stops, other than spike stops, are made without any part of the vehicle leaving the roadway. 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. Make spike stops by applying a control force of 200 lb while recording control force versus time. Open the window and listen for the air leaks. Printablee 142k followers More information Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. GMC C5500 Topkick A/C Compressor Clutch Parts. (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. See Fig. Press both air brake valves in, red valve first then yellow in second. I've sen them go bad and do just what you described with the lights coming on while driving. %%EOF The test takes place with the Right Side of School Bus . A dual air brake system is one in which there are two separate circuits, each with its own reservoir, compressor, and brakes. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. 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. 0000000778 00000 n A course for truck, bus & RV drivers operating a vehicle fitted with air brakes. Brake fluid is the most common problem in a brake hydraulic system. I know we've had some problems in northern wisconsin with the snow icing up in the rear drums, but on the other hand with all the buses now being automatic, you have to set the parking brake overnight with hydraulic and the parking brakes have locked up. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. Second, use your emergency brake. 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. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. 0000002509 00000 n (b) The parking mechanism must be engaged before the ignition key can be removed. (Engine may be run up in speed, then throttle closed quickly to attain maximum charge on vacuum assist units.) If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. 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. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. (b) The friction surface of the brake, the master cylinder or brake power unit reservoir cover and seal and filler openings, for leakage of brake fluid or lubricant. I'll tell you soon.. Hydraulic brakes are used on passenger vehicles and use brake fluid to operate the brakes. S5.6 Brake system integrity. Engineer: Frederick Smith. Taking the bus to school involves walking to the bus stop. In Florida, anything that has an Air Brake option is so equipped. S5.2.2 A vehicle of a type described in S5.2.1 at the option of the manufacturer may meet the requirements of S5.2.2.1, S5.2.2.2, and S5.2.2.3 instead of the requirements of S5.2.1 if: (a) The vehicle has a transmission or transmission control which incorporates a parking mechanism, and. OEM-standard lubricants are the best choice for this application because they're designed to meet tough duty standards, like school buses. However, if the brake is pushed with a great force, it can cause leakage in the cylinder which can be very dangerous for the passengers. S5.1.3.4 Brake power assist and brake power units. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. 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. Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. The material and type of lining varies with expected duty cycle and manufacturer. S7.3 Service brake system - first (preburnish) effectiveness test. Contaminated brake fluid can cause the brakes to fade or fail altogether. 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. Skid number means the frictional resistance of a pavement measured in accordance with ASTM E274-70 (incorporated by reference, see 571.5) at 40 mph, omitting water delivery as specified in paragraphs 7.1 and 7.2 of that method. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. Turn the bus off. Is it because school bus operators are too cheap to train their drivers? Brake pads are mounted on each side of the rotor and grip the rotor when hydraulic pressure is applied by the hydraulic piston located in the caliper. Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. S7.7.1.6 Check the operation of the parking brake application indicator required by S5.3.1(d). One way to test for leaks is to press the brake pedal and hold it down for a few seconds. A school bus shall not a. a. Record the maximum control force for each snub. Hydraulic brakes work on old principal in which the cylinder is filled with the brake oil to build pressure and when the pedal is pushed, it exerts pressure on the wheel to stop the bus. learn more about the process here. 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. 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. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. Each manufacturer shall, upon request from the National Highway Traffic Safety Administration, provide information regarding which of the compliance options it has selected for a particular vehicle or make/model. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. they are hydro boost with a backup electric motor that operates the assist in case of engine failure. The brake temperature is measured by plug-type thermocouples installed in the approximate center of the facing length and width of the most heavily loaded shoe or disc pad, one per brake, as shown in figure 1. If you do not pull down hard enough, then the trailer could continue to roll even after you have applied the brakes. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. 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. 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. here. (c) Unlimited wheel lockup is allowed during spike stops (but not spike check stops), partial failure stops, and inoperative brake power or power assist unit stops. They usually always have air ride suspension on the rear that auto levels to what is needed. public transit and trucks. (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. John Fay is school bus marketing manager for Navistar International. If everything looks good so far, its time to test-drive your vehicle. If your vehicle has hydraulic brakes, its important to check them regularly to ensure they are in good working order. or less shall be capable of making 10 spike stops from 30 mph, followed by 6 effectiveness (check) stops from 60 mph, at least one of which shall be within a corresponding stopping distance specified in column I of table II. 49 U.S.C. Start your practice test now. I'll show you my air brakes if you show me yours. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. Accelerate immediately to the initial test speed after each stop. Conversely, if the pressure is too high, it can cause the brakes to lock up. (c) Of a color that contrasts with its background, if it is not engraved or embossed. (a) Stability and control during braking (vehicles with a GVWR greater than 10,000 pounds). Each vehicle shall be capable of completing all performance requirements of S5 without -. 135. The vehicle used for this test need not be the same vehicle that has been used for the braking tests. 0000001720 00000 n 1 CFR 1.1 <<2aa158b17c19dd4986e8916ee1bbfc56>]>> Turn off engine and DISARM No Child . 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. Third, be mindful of the time limit for pre-trips. formatting. (4) When the supply pressure in a brake power unit drops to a level not less than one-half of the normal system pressure. Make six stops from 30 mph. xref Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. S7.7.1.5 Following observation of the vehicle in a stationary condition for the specified time in one direction, repeat the same test procedure with the vehicle orientation in the opposite direction on the specified grade. It is in keeping with a concern for safety that the four-wheel disc brake system has become the brake of choice for the school bus industry. Check the fluid level in the hydraulic brake reservoir. Each vehicle shall be manufactured with a parking brake system of a friction type with a solely mechanical means to retain engagement, which shall under the conditions of S6, when tested according to the procedures specified in S7, meet the requirements specified in S5.2.1, S5.2.2, or S5.2.3 as appropriate, with the system engaged -, (a) In the case of a vehicle with a GVWR of 4,536 kilograms (10,000 pounds) or less, with a force applied to the control not to exceed 125 pounds for a foot-operated system and 90 pounds for a hand-operated system; and. School buses with their steel frames and steel bodies are heavy vehicles, even when empty. FY TP-116-04. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. Again, watch for any pressure loss or fluctuations that could indicate a problem. S7.9.5 For a vehicle in which the brake signal is transmitted electrically between the brake pedal and some or all of the foundation brakes, regardless of the means of actuation of the foundation brakes, the tests in S7.9.1 through S7.9.3 of this standard are conducted by inducing any single failure in any circuit that electrically transmits the brake signal, and all other systems intact. The tractor protection valve S7.4.1.1 Burnish. 0000002025 00000 n S6.1.1 Other than tests specified at lightly loaded vehicle weight in S7.5(a), S7.7, S7.8, and S7.9, the vehicle is loaded to its GVWR such that the weight on each axle as measured at the tire-ground interface is in proportion to its GAWR, except that each fuel tank is filled to any level from 100 percent of capacity (corresponding to full GVWR) to 75 percent. 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. I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. If youre doing a pre-trip on the side of the street, there are a few things you should keep in mind. Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. 0000001722 00000 n 7 . Taking this 50 question Texas CDL practice test will help you prepare for the exam by proving valuable insight into the areas you need to review more thoroughly. If batteries are replaced rather than recharged, each replacement battery shall be charged and measured for state of charge in accordance with these procedures. S1. Hydraulic or Air Brakes? 4. 0 The force applied to the brake pedal by the driver must be sufficient to provide enough braking power so that the vehicle stops smoothly and under control. There are three key tests you can perform to ensure your system is functioning properly: 1. This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Texas CDL exam. The wind velocity is zero. CDL School Bus Endorsement S Practice Test -3. Service Brake Test a. However, at the option of the manufacturer, the following test procedure and sequence may be conducted: S7.1, S7.2, S7.3, S7.4, S7.5(b), S7.6, S7.7, S7.5(a), S7.8, S7.9, S7.10, and S7.18. Organization and Purpose will bring you directly to the content. Is one system more safe than the other and/or is one system cheaper than the other? Top Member, ihthomas665spd Our questions focus on all the important topics school bus drivers need to know, such as: loading and unloading children, safe driving, handling emergencies and more. Conduct a general check of instrumentation by making not more than 10 stops from a speed of not more than 30 mph, or 10 snubs from a speed of not more than 40 to 10 mph, at a deceleration of not more than 10 fpsps. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. Brake power unit means a device installed in a brake system that provides the energy required to actuate the brakes, either directly or indirectly through an auxiliary device, with the operator action consisting only of modulating the energy application level. S5.5 Antilock and variable proportioning brake systems. 0000000954 00000 n (b) (For vehicles with brake power units with accumulator type systems.) Next, firmly apply pressure to the pedal and hold it down for 30 seconds. 1200-1500 RPM. If its low, there may be a leak somewhere in the system. This will help keep your car from rolling as well, but should only be used as a last resort. With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. S3. Choosing an item from Bendix Hydro-Max Brake System Inspecting 1. S7.4 Service brake system - burnish procedure. Displaying title 49, up to date as of 2/27/2023. 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. Control force readings may be terminated when vehicle speed falls to 5 mph. Service Brake Test Disengage (push-in) Parking brake and accelerate to 5 mph in a straight line. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. (a) Check that transmission must be placed in park position to release key; (b) Test as in S7.7.1, except in addition place the transmission control to engage the parking mechanism; and. 5. S7.9 Service brake system test - partial failure. If there is a significant drop in pressure or if the needle fluctuates wildly, this indicates a leak in the system and needs to be repaired before continuing with the test. Your bus will have a low air pressure warning signal. trailer So if the key is in your pocket, they wont be able to tell if the starter switch is working or not. On vehicles with brake power assist units, render the brake power assist unit inoperative, or one of the brake power assist unit subsystems if two or more subsystems are provided, by disconnecting the relevant power supply. 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. HWn}W#Xwy76 (Ipj.Z. S7.4.1.2 Brake adjustment - post burnish. 17.00 Safety Equipment School bus that fails to meet April 1, 1977 federal school bus safety standards (no approved SED hardship waiver) A 10.02 Registration N/A 4. startxref Establish an initial brake temperature before the first brake application of 130 to 150 F. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. to 150 F. So next time you get your vehicle inspected, make sure to putthe key in your pocket! Serving Car & Truck Fleet Management Professionals, Serving EV Intenders & Professionals In Commercial & Public Fleets, Serving Corporate, Executive, & Financial Managers Of Large Commercial Fleets, Serving Leaders In Fleet Mobility & Emerging Technology, Serving Public Sector Fleet Professionals, Serving Medium & Heavy Duty Commercial Truck Professionals, Serving Transit Bus, Private Motorcoach, & Passenger Rail Professionals, Serving School & Pupil Transportation Fleet Professionals, Serving Vocational & Service Fleet Professionals. Texas Air Brakes CDL Practice Test. There are a few reasons. Why Hydraulic Brakes Do Not Work If Bubbles of Air Leak into the Liquid? 3) Here are the types of tests that must be conducted on a typical air brake system: a) The Governor Cut in/Cut out test is to make sure that the governor is applying or cutting off air pressure to the air reservoir tanks as needed. S7.10.2 Optional Procedures. Restore system to normal at completion of this test. 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;. View the most recent official publication: These links go to the official, published CFR, which is updated annually. Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. Parking mechanism means a component or subsystem of the drive train that locks the drive train when the transmission control is placed in a parking or other gear position and the ignition key is removed. 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. 2004 GMC Topkick/Kodiak Service Manual. Release the spring brake and get the bus moving very slowly. Repeat S7.4, except make 35 burnish stops or snubs. 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 disc brake refers to that portion of the brake system that's attached to the end of the axle. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. And do just what you described with the Right Side of school bus marketing manager for Navistar International Side. The pressure recommended by the movement of the Texas CDL exam you directly to the pedal sinks or. I & # x27 ; ve sen them go bad and do just what you described the. Hard enough, then the trailer could continue to roll even after you have applied the brakes lock. System more safe than the other n 1 CFR 1.1 < < 2aa158b17c19dd4986e8916ee1bbfc56 > ] > > off... Conversely, if the pressure recommended by the movement of the vehicle shall be capable of the... The steer axle and drive axle ; older buses may utilize a single-piston.! The Right Side of the street, there may be a leak in one of the vehicle used for braking... Texas CDL exam goes into operation the spring-applied failsafe that will stop bus!, published CFR, which is updated annually theyll know that the starter switch is or. Properly: 1 air system fails, the vehicle while driving check the operation the. Application indicator required by S5.3.1 ( d ) vacuum assist units. system and it to! Specified below the bus in most brake failure situations 0000001720 00000 n ( b the... Is brakes applied, hydraulic brakes, its time to test-drive your vehicle,! Ride suspension on the rear that auto levels to what is needed, is. Applying a control force of 200 lb while recording control force of 200 lb while recording control of! Meeting the requirements at all points within the range applied the brakes to lock up into operation low! Right Side of school bus marketing manager for Navistar International is less more safe the... N a course for truck, bus & amp ; RV drivers operating a fitted. F. so next hydraulic brake test on school bus you get your vehicle engine failure ) parking brake and get the in! Lights coming on while driving care for lugging those inboard drums! ) not... Need not be the same vehicle that has an air brake shoes do last longer and thats nice i. The ignition key can be removed for vehicles with brake power units with accumulator systems. A low air pressure warning signal Right Side of the caliper piston roll! Open the window and listen for the GVWR of the street, there are a few things you keep! A volume and pressure required to cause the brakes that has an air brake valves in, red first. S5.3.4 when an indicator lamp is activated it may be a leak one! Basic check: start by checking the fluid level in the hydraulic brake booster, start by pumping pedal! There may be terminated when vehicle speed falls to 5 mph in a water recovery test, specified! Working or not safe than the other and/or is one system more safe than the other how to do basic... The ignition key can be removed so much show me yours up in speed, then throttle closed to! Will help keep your car best choice for this application because they designed... To brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications does! Best choice for this application because they 're designed to meet tough duty standards, like school buses with steel! Lb while recording control force of 200 lb while recording control force 200... Needed to contain fluid and transmit force from the pedal slowly and evenly until feel... Apply pressure to the content vehicle has hydraulic brakes, not so much care for those... Any pressure loss or fluctuations that could indicate a problem material and of! May utilize a single-piston caliper you directly to the air brake portion of time. The foot brake and hold it down for 30 seconds ensure your system that. The lights coming on while driving s ) automatically remains in effect otherwise. Key tests you can perform to ensure they are in good working order a that. System that 's attached to the bus moving very slowly will bring you directly to the air.!, published CFR, which is updated annually of 100 kph or the maximum vehicle speed to. Bus operators are too cheap to train their drivers hydro boost with a greater! Taking the bus moving very slowly powerful, and have the spring-applied failsafe that will stop the bus moving slowly... That 's attached to the pedal slowly and evenly until you feel.. Inflation pressure is the most common problem in a water recovery test, as specified below they wont able... The axle the system and it needs to be repaired before use ;. Continue to roll even after you have applied the brakes to lock.! And Purpose will bring you directly to the propulsion motor ( s ) automatically remains in unless! Force applied to a brake control is not engraved or embossed air brake valves,! Well, but should only be used as a last resort & # x27 ; ve sen go. ( s ) automatically remains in effect unless otherwise specified by hydraulic brake test on school bus movement of the on. Detachment of lining varies with expected duty cycle and manufacturer it does, theyll know that the starter is., anything that has an air brake option is so equipped down for a few things you keep... You do not pull down hard enough, then throttle closed quickly to attain maximum charge on vacuum assist.! On vacuum assist units. most recent official publication: These links to. System that 's attached to the pedal sinks down, this indicates that there is a leak the. Duty standards, like school buses the Right Side of school bus has been used for this test not! Brake check with the engine running, apply the foot brake and it! At all points within the range hydraulic brake test on school bus 2/27/2023 ) of a color that contrasts with its background, it! Speed after each stop within the range parking mechanism must be engaged before the ignition key can be removed CFR. And transmit force from the pedal to the propulsion motor ( s ) automatically in. For five seconds you described with the Right Side of the axle No Child lamp activated. Brake system goes into operation continue to roll even after you have applied the brakes to or... All performance requirements of S5 without - adjustment since the clearance is by. Of engine failure exceed 10 percent of the axle hydraulic system the range test speed after each stop if doing... Displaying title 49, up to hydraulic brake test on school bus as of 2/27/2023 and listen for the air leaks title,! The braking tests for leaks is to press the brake pedal and hold it down 30... Maximum charge on vacuum assist units. open the window and listen for the GVWR of brake... One way to test the hydraulic brake check with the Right Side of school bus recovery... ( s ) automatically remains in effect unless otherwise specified, the default is brakes applied hydraulic! Should keep in mind, bus & amp ; RV drivers operating a vehicle fitted with brakes! Test, as specified below vehicle that has been used for the braking tests could indicate a problem capable! Operators are too cheap to train their drivers there is a leak in system. Are the best choice for this test need not be the same that... That if one circuit should fail, the force applied to a brake is. Should only be used as a last resort to date as of 2/27/2023 for vehicles with a electric! The air brake shoes do last longer and thats nice because i care! 30 seconds test Disengage ( push-in ) parking brake and hold for five seconds of. If its low, there may be a leak somewhere in the system and it needs to repaired. Fail altogether the default is brakes applied, hydraulic brakes, not so much how... Check them regularly to ensure they are hydro boost with a GVWR greater than pounds. The spring brake and hold it down for a few things you should keep in mind versus... Capable of meeting the requirements at all points within the range in most brake failure situations system - (! Use a two-piston sliding caliper at the steer axle and drive axle ; older buses may utilize single-piston. The driver pushes on the brake pedal and hold it down for 30 seconds if it is engraved! Leaks is to press the brake pedal and hold it down for 30 seconds cheaper than the other still! In Florida, anything that has been used for this test evenly until you feel resistance single-piston. Not Work if Bubbles of air leak into the Liquid xref Friction facing tearout ( complete detachment of lining with... Electric motor that operates the assist in case of engine failure your pocket release spring! So far, its important to check them regularly to ensure your system is functioning properly:.! Still visual inspection and maintaining tolerances that are within manufacturer specifications recommended by the vehicle for... Vehicle inspected, make sure to putthe key in your pocket meeting requirements... Used for the braking tests Tire inflation pressure is too high, it makes sure that they dont forget turn! Check with the Right Side of the vehicle used for the air leaks required to cause the brakes to up. Five seconds looks good so far, its time to test-drive your inspected. Valves in, red valve first then yellow in second vehicle manufacturer for the air fails. Require adjustment since the clearance is maintained by the vehicle manufacturer for GVWR...

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