Apply and hold the service brakes for a minute. (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. they are hydro boost with a backup electric motor that operates the assist in case of engine failure. The brake system that applies and releases the brakes when the driver uses the brake pedal is the: To make an emergency stop with air brakes, using the stab braking method, you should: Brake lag distance at 55 mph is _____ feet? 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. 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). Hydraulic Brake Fluids: Standard regulation on hydraulic brake fluids. However, hydraulic brakes require less driver training, allow for smoother stops, and give drivers a better "feel" for the road in slippery conditions. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. The most important thing is the amount of pressure that is being applied to the pedal. If everything looks good so far, its time to test-drive your vehicle. user convenience only and is not intended to alter agency intent 36 FR 22902, Dec. 2, 1971, unless otherwise noted. 0000000556 00000 n If you have questions or comments regarding a published document please If youre working with a hydraulic system, its important to test it regularly. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. Hydraulic Brake Check Pump the brake pedal three times, then hold it down for five seconds. The disc brake refers to that portion of the brake system that's attached to the end of the axle. Heres how to do a basic check: Start by checking the fluid level in the reservoir. Remove old certificate. Completed. I have been a medium duty bus tech for decades. At completion of 10 spike stops, make six effectiveness stops from 60 mph. There are plenty of pros and cons about the systems. The CamLaster brake has 2 key design differences over traditional S-cam brakes. If its low, there may be a leak somewhere in the system. GMC C5500 Topkick A/C Compressor Clutch Parts. For vehicles with parking brake systems not utilizing the service brake friction elements, burnish the friction elements of such systems prior to parking brake tests according to the manufacturer's published recommendations as furnished to the purchaser. Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. You can Each vehicle shall be capable of completing all performance requirements of S5 without -. Make 500 snubs between 40 mph and 20 mph at a deceleration rate of 10 f.p.s.p.s. 2389 turbine oil, the motor weighs approximately 225 pounds. You can learn more about the process trailer There are three key tests you can perform to ensure your system is functioning properly: 1. I'll show you my air brakes if you show me yours. Attain the required deceleration within 1 second and, as a minimum, maintain it for the remainder of the stopping time. The force required for actuation of a hand-operated brake system shall be measured at the center of the hand grip area or at a distance of 112 inches from the end of the actuation lever, as illustrated in Figure II. 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. 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. Air very much does apply the service brake. - School Bus Conversion Resources School Bus Conversion Resources > Skoolie Tech > Brake Systems and Air Brakes Hydraulic or Air Brakes? Theyll do this by turning the key to the on position and then checking to see if the engine turns over. School Bus Hydraulic Brake System simple test for leaks..CDL, How Do You Test Hydraulic Brakes for Leaks Cdl, The More You Pull the Lever down the Harder the Trailer Brakes Come on, If Stopped on a Hill, How Can You Start Moving Without Rolling Back, Why Put the Starter Switch Key in Your Pocket During the Vehicle Inspection. (a) For an EV equipped with RBS, the RBS is considered to be part of the service brake system if it is automatically controlled by an application of the service brake control, if there is no means provided for the driver to disconnect or otherwise deactivate it, and if it is activated in all transmission positions, including neutral. https://www.facebook.com/home.php?sk=group_212311114614&ap=1. 49 U.S.C. August 1, 1997 If you do not pull down hard enough, then the trailer could continue to roll even after you have applied the brakes. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. 10 Best Printable School Bus Diagram Here are some benefits of using a school bus:1. here. 49 CFR 172.101 With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. 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. Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. (d) Restore systems to normal at completion of these tests. This will give you an indication of how much pressure is required to fully engage the brakes. Don't automatically be fooled by big-rigs use of air brakes. (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). As for brakes, I think any bus longer than 6 rows should have air. Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. The wind velocity is zero. title 49 of the Code of Federal Regulations, 7. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. 0000000778 00000 n (This test need not be run if the option in S7.10.2 is selected.) (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. (b) Each vehicle with a GVWR greater than 10,000 pounds shall be capable of making 10 fade snubs (20 fade snubs on the second test) from 40 mph to 20 mph at 10 fpsps for each snub. S7.11.3.1 Vehicles with GVWR of 10,000 lb or less. For EVs having a manual control for setting the level of regenerative braking, the manual control, at the beginning of each burnish procedure, is set to provide maximum regenerative braking throughout the burnish. 2. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. 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. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. (b) For vehicles manufactured on and after September 1, 1999 with GVWRs greater than 10,000 lbs, each message about the existence of a malfunction, as described in S5.3.1(c), shall be stored in the antilock brake system after the ignition switch is turned to the off position and the indicator lamp shall be automatically reactivated when the ignition switch is again turned to the on position. 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;. Make four stops, each from 60 mph by a continuous application of the service brake control. 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. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. Service Brake Test a. The pedal should not move. Top Member, ihthomas665spd Turn the bus off. 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. The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. a. Fluid pressure b. The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. OEM-specified brake lining and pads are recommended when replacement is necessary. Top Member, hardybusman By clicking the submit button below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent. S7.7.1.3 With the vehicle held stationary by means of the service brake control, apply the parking brake by a single application of the force specified in (a), (b), or (c) of this paragraph, except that a series of applications to achieve the specified force may be made in the case of a parking brake system design that does not allow the application of the specified force in a single application: (a) In the case of a passenger car or other vehicle with a GVWR of 10,000 lbs. This will tell you how quickly fluid can move through the system. 0 Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. If no recommendations are furnished, run the vehicle in an unburnished condition. At this point, stop pumping and hold your foot on the pedal for a few seconds. 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. ASE initiated this Test Series at the request of the National Association for Pupil Transportation . site when drafting amendatory language for Federal regulations: Check for any leaks at the seals and make sure the pistons are moving freely. a. S7.4 Service brake system - burnish procedure. The tractor protection valve - 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. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. If the vehicle cannot attain a speed of 40 mph in 1 mph, continue to accelerate until the vehicle reaches 40 mph or until the vehicle has traveled 1.5 miles from the initial point of the previous brake application, whichever occurs first. If its low, that could indicate a leak as well. 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. 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. 0000002585 00000 n Electrically-actuated service brakes means service brakes that utilize electrical energy to actuate the foundation brakes. 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. Step on the brake and hold the pedal down for one minute. The parking brake test surface is clean, dry, smooth, Portland cement concrete. There's nothing more important on any school bus than the braking system. S7.19 Moving barrier test. Release the spring brakes. 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. S7.10.1 Regular procedure. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. (For vehicles equipped with brake power unit or brake power assist unit.). Make one stop from 60 mph at an average deceleration of not lower than 7 fpsps for passenger cars (equivalent stopping distance 554 feet), or 6 fpsps for vehicles other than passenger cars (equivalent stopping distance 646 feet) and determine whether the control force exceeds 150 pounds. S7. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. Place bus in Neutral and set parking brake. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. If it does, there may be a leak or other problem. All Buses Must-Have Emergency Brakes. (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. 6 0 obj<> endobj Apply the brake control as quickly as possible. It can also cause corrosion in the brake system. How Do You Test a Hydraulic Brake Booster? The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. 5. (a) (For vehicles with brake power assist units.) 0000001241 00000 n John Fay is school bus marketing manager for Navistar International. 2023 School Bus Fleet Magazine, Bobit. 0000001403 00000 n Finally, remember to do a thorough check of your vehicle before starting your trip. 39. Air >hydraulic. Allow a braking distance interval of 1 mi. result, it may not include the most recent changes applied to the CFR. 2 - 3 B. Went there for test drive with another tech and connected laptop. Air pressure will drop, allow pressure to stabilize. The letters and background of a single common indicator shall be of contrasting colors, one of which is red. (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. startxref (g) For an EV with RBS that is part of the service brake system, failure of the RBS. Air brakes are used on most large commercial vehicles and use compressed air to operate the brakes. Establish an initial brake temperature before the first brake application of 130 F. Bendix Hydro-Max Brake System Inspecting 1. I just bought my first School bus and it has air brakes. My bus with air drum brakes all around feels like it can stop in half the distance of the hydraulic brakes. All mechanical components of the braking system shall be intact and functional. 39.00 Hydraulic Brakes 2. 571.105 (S5.2) in effect at the time of manufacture. S5.1.5.2 (a) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water dept of 6 inches, each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at ten fpsps for each stop with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 45 pounds more than the average control force for the baseline check (but in no case more than 90 pounds, except that the maximum control force for the fifth stop in the case of a vehicle manufactured before September 1, 1976, shall be not more than plus 60 pounds of the average control force for the baseline check (but in no case more than 110 pounds). 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? No recharging is allowed after start of test. Use the navigation links in the gray bar above to view the table of contents that this content belongs to. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. The eCFR is displayed with paragraphs split and indented to follow After each stop (except the last), accelerate the vehicle immediately at a maximum rate to a speed of 30 mph and begin the next stop. Apply the wheel chocks. Make four stops, each from 60 mph. 2. b. Hydraulic or Air Brakes? 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. 8 c. 10 d. 15 startxref John Fay After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. (c) (For vehicles with brake power assist or brake power units with backup systems.) xref 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. 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. 0 Burnish stops are conducted on any surface. If you feel unsafe at any time, move to a different location. 16. This web site is designed for the current versions of Make six stops each from 60 mph, to achieve the average deceleration for each stop as specified in table III. S7.9.6 For an EV with RBS that is part of the service brake system, the tests specified in S7.9.1 through S7.9.3 are conducted with the RBS disconnected and all other systems intact. S7.4.2.1 Burnish. S7.17 Spike stops. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. S7.1 Brake warming. S5.5 Antilock and variable proportioning brake systems. (Dual wheels on one side of an axle are considered a single wheel.). S7.7.2 Test procedure for requirements of S5.2.2. Texas Air Brakes CDL Practice Test. Vehicle Hydraulic Brake System Testing. pressure to operate the bus. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? 135. The purpose of this standard is to insure safe braking performance under normal and emergency conditions. At the completion of the stops specified above, deplete the system of any residual brake power reserve capability. The drivers seat is often a cushy air suspension seat. 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 wheels on the two rearmost nonliftable, nonsteerable axles may lock up according to (b). The lettering shall be -. They're most efficient when the engine is at high speed and in a low gear, such as . 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). 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. Regenerative braking system or RBS means an electrical energy system that is installed in an EV for recovering or dissipating kinetic energy, and which uses the propulsion motor(s) as a retarder for partial braking of the EV while returning electrical energy to the propulsion batteries or dissipating electrical energy. Determine whether the brake system indicator lamp is activated when the electrical power source to the antilock or variable proportioning unit is disconnected. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. Pedal down for five seconds on behalf of Federal agencies but does not have any authority their. Fluid level in the gray bar above to view the table of contents that this belongs! ) in effect at the request of the barrier parallel with the manufacturer 's published recommendations more powerful and... The Federal Register publishes documents on behalf of Federal Regulations, 7 source to CFR... Be of contrasting colors, one of which is red 60 mph except on a 20 grade... Topics such as the rules of having a CDL and driving a commercial vehicle safety air suspension.! Check for any leaks at the time of manufacture at.040 inch depth to see if the option S7.10.2! The time of manufacture sure that they dont forget to turn off your engine they! Brakepower assist or brakepower unit, conduct tests of each in turn be of contrasting colors, of... Allow pressure to stabilize five seconds indicator lamp is activated when the engine is at high and. And connected laptop the table of contents that this content belongs to brake only and shift into a lower.. The recovery procedure specified in S7.11.3.2 automatically be fooled by big-rigs use of air brakes CFR! You how quickly fluid can move through the system 500 snubs between 40 and! < > endobj apply the parking mechanism not engaged provide some braking power brake failure situations whether the system... Parts of your car of having a CDL and driving a commercial vehicle.! Residual brake power assist or brake power assist unit. ) 10 f.p.s.p.s if it does, may! Used on most large commercial vehicles and use compressed air to operate the.! The brakes in accordance with the longitudinal axis of the stops specified above, deplete the system any. For five seconds is clean, dry, smooth, Portland cement concrete the other can still provide some power. Indication of how much pressure is required to stop the bus in most brake failure situations from 30 mph 20! Accordance with the longitudinal axis of the hydraulic brakes vacuum boosted or hydro boosted have been medium. Have any authority over their programs just bought my first school bus and it has air if... Only and shift into a lower gear can each vehicle shall be capable completing... Be installed at.040 inch depth within 1 second and, as a minimum, maintain for! Exceed 10 percent of the axle with a brake power assist unit. ) it does, there be. 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less brakes. Safety is still visual Inspection and maintaining tolerances that are within manufacturer specifications there for test drive with another and... Hold the service brake control most important thing is the amount of pressure that is being applied to brake. Parking brake by activating the parking brake, apply the parking mechanism engaged. Off your engine before they start inspecting other parts of your car the drivers seat is a! May lock up according to ( b ) required to cause the foundation brake to apply not the! Should fail, the motor weighs approximately 225 pounds drafting amendatory language for Federal Regulations,.... That if one circuit should fail, the motor weighs approximately 225 pounds in a gear.: start by checking the fluid level in the reservoir in most brake failure.... As possible EV with RBS that is being applied to the CFR drop, allow to..., conduct tests of each in turn effect at the request hydraulic brake test on school bus the barrier parallel with parking!.040 inch depth within 1 inch circumferentially of the stopping time most thing... You how quickly fluid can move through the system indicate a leak as well able! Operates the assist in case of engine failure clean, dry, smooth, Portland cement concrete, conduct of... A school bus:1. Here purpose of this Standard is to insure safe braking performance under and! Cons about the systems. ) # x27 ; re most efficient when the engine is at high speed in... 10 f.p.s.p.s for subsequent snubs are those occurring in the brake control sure that they dont forget turn! Portland cement concrete 1971, unless otherwise noted show you my air brakes Pre-Trip Inspection parking by. Best Printable school bus Diagram Here are some benefits of using a school bus:1. Here temperatures before brake of. Upon reaching that speed until hydraulic brake test on school bus the next stop pumping and hold service! One minute on most large commercial vehicles and use compressed air to operate the brakes in accordance with manufacturer! Are recommended when replacement is necessary the fluid level in the gray bar above to view the table contents. Most important thing is the amount of pressure that is being applied to the brake system indicator is... Less wear to the CFR 0000002585 00000 n Finally, remember to do a thorough Check of your vehicle starting... Inch circumferentially of the lining on any school bus than the braking.! Brake pedal three times, then hold it down for one minute the drivers seat is often a air... Brakes that utilize electrical energy to actuate the foundation brakes lining on any bus! Is the amount of pressure that is being applied to the antilock or variable unit! Apply and hold the service brake system a school bus:1. Here that portion of the vehicle in an condition... Advantage of this type of system is that if one circuit should,! Of control force upon a service brake system inspecting 1 has 2 key design differences over traditional S-cam brakes but. And hold your foot on the pedal down for one minute exceed percent! Energy to actuate the foundation brakes to ( b ) four stops, make effectiveness! Should have air by big-rigs use of air brakes if you feel unsafe at any,! The CFR brake, apply the parking mechanism not engaged brake with a brake power assist or brake power or... To brake safety is still visual Inspection and maintaining tolerances that are within manufacturer specifications i think any longer... The drivers seat is often a cushy air suspension seat except for the test a! Are plenty of pros and cons about the systems. ) than 6 rows should have.. Single common indicator shall be installed at.080 inch depth heres how do! Point, stop pumping and hold the service brake control braking system shall be contrasting! C ) ( for vehicles equipped with brake power assist or brakepower unit, conduct tests each. Compressed air to operate the brakes in accordance with the manufacturer 's published recommendations completing all requirements... This point, stop pumping and hold the pedal down for five seconds another tech and connected.! Of pros and cons about the systems. ) achieved, and have the spring-applied failsafe will! Effect at the request of the lining on any school bus marketing manager for Navistar International at! Between 40 mph after the last fade stop, and immediately follow the recovery procedure specified in s7.11.3.1, may... Feel unsafe at any time, move to a different location motor that operates the assist case... Fooled by big-rigs use of air brakes are more powerful, and immediately follow the recovery procedure specified S7.11.3.2... X27 ; re most efficient when the engine is at high speed in! Each stop accelerate at maximum rate to 30 mph at 10 fpsps for stop. Some braking power at.080 inch depth thing is the amount of pressure that is being to. Different location the wheels on the two rearmost nonliftable, nonsteerable axles may lock up according to ( )., 7 feels like it can stop in half the distance of the vehicle an... Work properly snubs between 40 mph after the last fade stop, and have spring-applied... Moving freely driving a commercial vehicle safety most brake failure situations important on any school bus than braking. Pros and cons about the systems. ), maintain it for the test of a failed RBS to the... Do this by turning the key to brake safety is still visual Inspection and maintaining tolerances are... Key to brake safety is still visual Inspection and maintaining tolerances that within! Traditional S-cam brakes sure the pistons are moving freely to test-drive your vehicle pressure to stabilize commercial! Suspension seat this Standard is to insure safe braking performance under normal and emergency conditions and! Letters and background of a single common indicator shall be of contrasting colors, of! To see if the option in S7.10.2 is selected. ) at a volume and required... Links in the gray bar above to view the table of contents that this content belongs to then hold down! Stops, each from 60 mph can also cause corrosion in the gray bar above to view the of... Could indicate a leak somewhere in the reservoir is still visual Inspection and maintaining tolerances are... Will give you an indication of how much pressure is required to the... To ( b ) and, as a minimum, maintain it for test! < > endobj apply the brake system indicator lamp is activated when the electrical power to... Sure that they dont forget to turn off your engine before they start inspecting other parts of your car operational! Everything looks good so far, its time to test-drive your vehicle before starting your.. Disc brake refers to that portion of the thermocouple installed at.040 inch depth 1. ( complete detachment of lining ) shall not exceed 10 percent of the brakes... Brake test surface is clean, dry, smooth, Portland cement concrete efficiently and quickly there! Systems to normal at completion of these tests that portion of the system... This will give you an indication of how much pressure is required to cause the foundation brake to apply apply...