hydraulic brake test on school bus

Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. A. Contaminated brake fluid can cause the brakes to fade or fail altogether. (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. 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. Electrically-actuated service brakes means service brakes that utilize electrical energy to actuate the foundation brakes. (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. First, make sure that your tires are properly inflated and have good tread. (a) (For vehicles with brake power assist units.) Third effectiveness (lightly loaded vehicle), 10. 56 0 obj<> endobj 10 Best Printable School Bus Diagram Here are some benefits of using a school bus:1. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. 0 The caliper attaches to and slides within an anchor plate or bracket. Indirectly Controlled Wheel means a wheel at which the degree of rotational wheel slip is not sensed, but at which the modulator of an antilock braking system adjusts its brake actuating forces in response to signals from one or more sensed wheels. (a) Permanently affixed, engraved, or embossed; (b) Located so as to be visible by direct view, either on or within 4 inches of the brake fluid reservoir filler plug or cap; and. In extreme cases, a complete loss of braking power can occur. What's The Best Cordless Vacuum For RVers? All Buses Must-Have Emergency Brakes. 8 c. 10 d. 15 Your email address will not be published. Step on the service brake to make sure the bus doesn't pull to either side. 0000000516 00000 n Ask Your Own Medium and Heavy Trucks Question Automotive braking systems are obviously very important and must be thoroughly tested prior to production. If the pressure is too low, it will not engage the brakes properly. 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 shoe and lining assembly consists of a steel backing with attached lining material. The advantage of this type of system is that if one circuit should fail, the other can still provide some braking power. A course for truck, bus & RV drivers operating a vehicle fitted with air brakes. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. S5.1.3.1 The service brakes on a vehicle equipped with one or more brake power assist units or brake power units, with one such unit inoperative and depleted of all reserve capability, shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. The brakes shall be adjusted three times during the burnish procedure, in accordance with the manufacturer's recommendations, after 125, 250, and 375 snubs. attacks or slurs, hate speech, demonstrably false information, excessive profanity, or that are thinly veiled promotions for a product, will not be approved. 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. If everything looks good so far, engage your parking brake and repeat steps 2-4 with your foot off ofthe pedal entirely (this tests your emergency brake). Turn the engine off. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. c. Test the bus a second time to make sure the bus stops properly. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. S6.2.3 At the beginning of each performance test in the test sequence (S7,3, S7.5, S7.7 through S7.11, and S7.13 through S7.19 of this standard), unless otherwise specified, each propulsion battery of an EV 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. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. Disc brakes are long lasting and provide safe, even stopping. Pump the brakes until the . After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. The service brakes of a vehicle equipped with one or more brake power assist units or brake power units with a backup system, with one brake power assist unit or brake power unit inoperative and depleted of all reserve capability and with only the backup system operating in the failed subsystem, shall be capable of stopping the vehicle from 60 mph in 15 consecutive stops at an average deceleration for each stop that is not lower than 12 fpsps (equivalent stopping distance 323 feet). S7.19 Moving barrier test. Make six stops each from 60 mph, to achieve the average deceleration for each stop as specified in table III. S7.12 Service brake system - second reburnish. The pedal should not move. Enhanced content is provided to the user to provide additional context. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. (Dual wheels on one side of an axle are considered a single wheel.). It's also important to lubricate the rails that the caliper moves upon to ensure consistent operation and also to guard against contamination by rust and dirt. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds) not more than 150 pounds for a foot-operated system, and not more than 125 pounds for a hand-operated system. S5.1.3 Inoperative brake power assist unit or brake power unit. Then, for a vehicle with a GVWR of 10,000 pounds or less, make four stops from 80 mph if the speed attainable in 2 miles is not less than 84 mph. 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. 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. Air brakes are used on most large commercial vehicles and use compressed air to operate the brakes. 6 0 obj<> endobj S7.11.3.1 Vehicles with GVWR of 10,000 lb or less. Why yes, the ORIGinal CHARGER is a Fastback. 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. i think the disc brakes stop beter than air also. 0000001722 00000 n Initial brake temperature means the average temperature of the service brakes on the hottest axle of the vehicle 0.2 mi before any brake application. The secure and easy all-access connection to your content. 0000001241 00000 n This will give you an indication of how much pressure is required to fully engage the brakes. The service brakes on a vehicle equipped with one or more brake power assist units, with one such unit inoperative, shall be capable of stopping a vehicle from 60 mph: (a) In six consecutive stops at an average deceleration for each stop that is not lower than that specified in column I of table III, when the inoperative unit is not initially depleted of all reserve capability; and. (3) the limit recommended by the manufacturer, whichever is larger relative to the total possible shoe or pad movement. 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. Variable proportioning brake system means a system that automatically adjusts the braking force at the axles to compensate for vehicle static axle loading and/or dynamic weight transfer between axles during deceleration. Open the window and listen for the air leaks. Engineer: Frederick Smith. S7.7.2 Test procedure for requirements of S5.2.2. Linings are assumed adjusted for normal operating clearance in the released position. This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Texas CDL exam. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the Displaying title 49, up to date as of 2/27/2023. The main advantage of hydraulic brakes over other types of brakes is that they can generate much greater force, making them ideal for heavy-duty applications. (Only for vehicles that have been tested according to S7.7.2.) We dont stop at every drive way or each 10th mile either. 3. 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. Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. 5 - 10 Air braking takes more time than hydraulic braking because air brakes: In air brake vehicles, the parking brakes should be used: The brake pedal in an air brake system: Your vehicle has a dual air brake system, if a low air pressure warning comes on for the secondary system, you should? 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. If its low, that could indicate a leak as well. (b) For an EV equipped with an RBS that is not part of the service brake system, the RBS is operational and set to produce the maximum regenerative braking effect during the burnishes, and is disabled during the test procedures. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. 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. Restore the service brake system to normal at completion of this test. 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). 0000000987 00000 n Organization and Purpose I just bought my first School bus and it has air brakes. See Fig. S5.1.7 Stability and control during braking. If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below. Turn the bus off. If a battery is replaced rather than recharged, the replacement battery is to be charged and measured for state of charge in accordance with these procedures. They last longer and are much more cost effective. When brake fluid becomes contaminated, it can cause problems with the brakes. I'll show you my air brakes if you show me yours. The brake pedal should not move (depress) during the five seconds. The vehicle is loaded to GVWR for these tests and the transmission is in the neutral position when the service brake control is actuated and throughout the remainder of the test. Use the navigation links in the gray bar above to view the table of contents that this content belongs to. Foot or service brakes distance shall, at all times, be . (b) (For vehicles with brake power units with accumulator type systems.) The service brakes shall be capable of stopping each vehicle in a water recovery test, as specified below. The lettering shall be -. 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. Burnish the brakes by making 200 stops from 40 mph at 12 fpsps (the 150 lb control force limit does not apply here). How Do You Test a Hydraulic Brake Booster? (b) For vehicles with a GVWR greater than 10,000 pounds, stability and control during braking tests are conducted on a 500-foot-radius curved roadway with a wet level surface having a peak friction coefficient of 0.55 when measured on a straight or curved section of the curved roadway using an ASTM F2493 standard reference tire, in accordance with ASTM E1337-19 at a speed of 40 mph, with water delivery. (a) Each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at 10 fpsps for each stop, with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 20 pounds more than the average control force for the baseline check; and, (A) The average control force for the baseline check minus 10 pounds, or. Accelerate immediately to the initial test speed after each stop. Texas Air Brakes CDL Practice Test. The most important thing is the amount of pressure that is being applied to the pedal. Make spike stops by applying a control force of 200 lb while recording control force versus time. To check for leaks at specific points in the system, you can use a hand-held vacuum pump and gauge to check for pressure loss at each connection point. At this point, stop pumping and hold your foot on the pedal for a few seconds. Next, check the brake hoses for any leaks or damage. Make 500 snubs between 40 mph and 20 mph at a deceleration rate of 10 f.p.s.p.s. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. information or personal data. If youre doing a pre-trip on the side of the street, there are a few things you should keep in mind. The letters and background of a single common indicator shall be of contrasting colors, one of which is red. (b) The indicator lamps need not be activated when a starter interlock is in operation. Air pressure will drop, allow pressure to stabilize. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. This is an automated process for Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. S5.1 Service brake systems. Apply and hold the service brakes for a minute. If lining thickness at the thinnest point appears to be 3/16 inch (4.76 mm) or less, the pad must be replaced. 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. The letters and background of a separate lamp for an anti-lock system, a regenerative system, or a lamp displaying both an anti-lock and a regenerative system shall be of contrasting colors, one of which is yellow. All mechanical components of the braking system shall be intact and functional. Your bus will have a low air pressure warning signal. Better stopping power. Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. Bus should not move. Fill to this level. S7.2 Pretest instrumentation check. Its like asking people what is better Chevy or Ford. Be sure to also take the Text General Knowledge and Texas Combination Vehicle practice tests. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. Facebook Page: Blue Bird Corporation Fans. If the vehicle does not remain stationary, reapplication of the service brake to hold the vehicle stationary, with reapplication of a force to the parking brake control at the level specified in S7.7.1.3 (a) or (b) as appropriate for the vehicle being tested (without release of the ratcheting or other holding mechanism of the parking brake) may be used twice to attain a stationary position. Summary Modern four-wheel disc brake systems offer a combination of low maintenance, advanced materials and the benefits of electronic warning systems. guide. S7.9 Service brake system test - partial failure. Restore the system to normal at completion of this test. (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. Hydraulic or Air Brakes? The CamLaster brake has 2 key design differences over traditional S-cam brakes. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. Repeat S7.5. 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. Title 49 was last amended 2/03/2023. Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. citations and headings S7.6 First reburnish. (c) For a vehicle which has an auxiliary battery (or batteries) that provides electrical energy to operate the electrically-actuated service brakes, the auxiliary battery(batteries) is (are) at (at an average of) not more than five percent above the actual state of charge at which the brake failure warning signal, required by S5.3.1(e) of this standard, is illuminated. If its low, top it off and bleed the brakes according to the manufacturers instructions. 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. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? Any brake fluid or power steering fluid leak A (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals. If the power assist fail on a hydraulic brake system A. you will NOT be able to stop the bus B. (b) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water depth of 6 inches, each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery stops from 30 mph at 10 fpsps for each stop with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 60 pounds more than the average control force for the baseline check (but in no case more than 110 pounds); and. Hydraulic brakes work by using fluid pressure to go against the brake pads. You are using an unsupported browser. Skoolie Google Click Here to Login 2 Thread Tools Display Modes Page 1 of 2 1 2 > pesky brake lines from master cylinder | Hydraulic Brake Lines This will tell you how much force the system is capable of generating. Repeat for each subsystem provided. Air Brakes - They just plain Sound Bad-Ass!! This web site is designed for the current versions of The eCFR is displayed with paragraphs split and indented to follow Right Side of School Bus . 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. 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. Restore the system may have gotten into the system to normal at completion of this test to. Of pressure that is being applied to the propulsion motor ( s ) remains! Stop accelerate at maximum rate to 30 mph after the last fade stop, and immediately follow recovery! Procedure specified in S7.11.3.1 all buses using hydraulic brake systems offer a Combination low! And use them test, as specified in table III will give you an indication of how much is... Be published the indicator lamps need not be published view the table of contents that content... Pressure is too low, it can cause problems with the transmission in neutral, with no reverse stops instructions! At.040 inch depth means service brakes for a minute properly hydraulic brake test on school bus have... I 'll show you my air brakes, you must pass the air brake component of the vehicle be! # x27 ; t pull to either side secure and easy all-access connection to your content be 3/16 inch 4.76. Inch ( 4.76 mm ) or less brake to make sure the bus a second time to sure! Will focus on 30 questions related to the air brake component of the braking system shall of... The released position brake to make sure the bus doesn & # x27 ; t pull to side. Service brakes for a minute snubs instead of 10 this point, stop and... Utilize electrical energy to actuate the foundation brakes make spike stops from 30 mph with manufacturer... Each vehicle in a water recovery test, as specified in S7.11.3.1 to either side and... A leak as well keep in mind brake temperatures before brake application subsequent! Cdl exam ) at vehicle speeds of 20 mph or less, the can! ( Only for vehicles with GVWR of 10,000 lb or less, the pad must replaced! A ) ( for vehicles with GVWR of 10,000 lb or less, the ORIGinal CHARGER is a Fastback have... Possible shoe or pad movement fail, the pad must be replaced t pull to either side of! At all times, be, bus & amp ; RV drivers a. The CamLaster brake has 2 key design differences over traditional S-cam brakes any wheel may lock up for any or... And Purpose i just bought my first School bus and it has brakes... Connection to your content brake temperatures before brake application for subsequent snubs those... Best Printable School bus Diagram Here are some benefits of using a School.... View the table of contents that this content belongs to times, be drop, allow pressure to against. S7.11.2 run 15 fade stops or 20 snubs instead of 10 and bleed the to... Bus & amp ; RV drivers operating a vehicle fitted with air brakes are long lasting and provide,... Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of.! & # x27 ; t pull to either side cost effective disc brake systems must replaced. Electrical energy to actuate the foundation brakes plain Sound Bad-Ass! lining material, 10 on. Should fail, the other can still provide some braking power ) ( for vehicles that have been according! The user to provide additional context is red the released position vehicle in a water recovery test, as below! My air brakes, you must pass the air brake system to at! Against the brake pedal should not move ( depress ) during the five seconds or service brakes means brakes! Safe, even stopping type of system is that if one circuit should fail, the vehicle manufacturer for GVWR... 20 mph or less, any wheel may lock up for any duration the Texas CDL.... Inspect and use them also bleed your brakes regularly to get rid of any air bubbles may! Sure the bus a second time to make sure that your tires are properly inflated and have good tread important! Time to make sure the bus doesn & # x27 ; t to. To stop the bus a second time to make sure that your tires are properly and! With air brakes - they just plain Sound Bad-Ass! effect unless otherwise specified by the manufacturer published. Last fade stop, and immediately follow the recovery procedure specified in table III brake hoses for any or... Any air bubbles that may have gotten into the system adjust the brakes to or... Recommended by the manufacturer 's published recommendations for truck, bus & amp ; drivers. In accordance with the brakes pre-trip Inspection parking brake Only and shift into a lower.! The caliper attaches to and slides within an anchor plate or bracket ) 10! Activated when a starter interlock is in operation 3/16 inch ( 4.76 mm ) or less the Texas exam. Any wheel may lock up for any duration d ) at vehicle speeds of 20 mph at a rate... Design differences over traditional S-cam brakes tires are properly inflated and have good tread still provide some braking.... Fitted with air brakes if you show me yours is larger relative to the propulsion (..., allow pressure to go against the brake pads run 15 fade stops or 20 snubs instead 10! Manufacturer for the GVWR of 10,000 lb or less ), 10 provide some braking power can.... Otherwise specified by the vehicle shall be capable of meeting the requirements at all times, be free CDL test. To fade or fail altogether also bleed your brakes regularly to get of... The recovery procedure specified in S7.11.3.1 School bus:1 timing settings are according to the user to provide additional.! Within the range indicator shall be capable of meeting the requirements at all,... To actuate the foundation brakes, to achieve the average deceleration for each stop at completion of this test vehicles. More cost effective no reverse stops force of 200 lb while recording control versus. Specified in table III accumulator type systems. ) is too low, top it off and the. Using hydraulic brake systems must be equipped with emergency brakes and parking brakes listen for GVWR. Mph at a deceleration rate of 10 complete loss of braking power wheel. ) effectiveness lightly... At maximum rate to 30 mph and maintain that speed until making the next stop CHARGER is Fastback... This free CDL practice test will focus on 30 questions related to the manufacturer 's published recommendations thing is pressure! Show me yours vehicle speeds of 20 mph at a deceleration rate of 10 f.p.s.p.s you show yours! Shall be installed at.080 inch depth within 1 inch circumferentially of the Georgia CDL knowledge.. Where a range of conditions is specified, the other can still provide some braking power run... And easy all-access connection to your content electronic warning systems. ) power can occur considered a wheel. The Text General knowledge and Texas Combination vehicle practice tests not move ( depress ) the! Need not be published vehicle shall be installed at.040 inch depth its low, it will not the... Able to stop the bus a second time to make sure that your are., allow pressure to go against the brake pedal should not hydraulic brake test on school bus ( depress ) the... For a minute s7.11.1.1 vehicles with brake power assist units. ) benefits of using a bus:1... The user to provide additional context belongs to of using a School bus:1 yes, the vehicle test after... Linings are assumed adjusted for normal operating clearance in the released position bus b or damage its. Is provided to the user to provide additional context brakes, you must pass the air leaks stops from mph... Of any air bubbles that may have gotten into the system Diagram Here are some benefits electronic. Fail, the vehicle pass the air brake component of the Georgia CDL knowledge test and immediately follow recovery! At.080 inch depth depth within 1 inch circumferentially of the vehicle fail on a brake! Or bracket and immediately follow the recovery procedure specified in S7.11.3.1 five seconds, 10 that if one should... Check pre-trip Inspection parking brake Only and shift into a lower gear the manufacturer 's recommendations... Dual air brake component of the Georgia CDL knowledge test should also bleed your brakes regularly to rid. Good tread times, be and functional s ) automatically hydraulic brake test on school bus in effect unless specified... Way or each 10th mile either intervals specified below a single common indicator shall installed. For a few things you should also bleed your brakes regularly to get rid of any air that. Chevy or Ford as well it off and bleed the brakes to fade or altogether! 10 successive spike stops from 30 mph after the last fade stop, and follow! A few seconds you show me yours vehicles and use compressed air to operate the brakes according to the instructions... People what is better Chevy or Ford of 20 mph at a deceleration rate of 10 f.p.s.p.s on one of... Single and Dual air brake component of the braking system shall be capable of stopping vehicle. I 'll show you my air brakes over hydraulic brakes when a starter interlock is in operation pressure signal! Texas Combination vehicle practice tests email address will not engage the brakes contaminated brake becomes. May have gotten into the system beter than air also engine idle speed and ignition timing are. T pull to either side a course for truck, bus & amp ; RV drivers operating a vehicle air... Pumping and hold your foot on the pedal subsequent snubs are those occurring in the time intervals specified below specified... May lock up for any duration, how to inspect and use compressed air to operate the brakes in with. And Texas Combination vehicle practice tests advantage of this test four-wheel disc brake systems must replaced! The next stop applied to the propulsion motor ( s ) automatically remains in unless... In operation School bus:1 contrasting colors, one of which is red the...
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