- Study guides, Class notes & Summaries

In hydraulic disc brakes, the pads are forced against the rotors by: the pistons As the pressure of fluid received by the wheel cylinder of a drum brake system increases, which of the following happens? The wheel cylinder cups and pistons are forced apart Which of the following safety devices delays application of front disc brakes in a disc/drum system until pressure is built up in the hydraulic system? a metering valve In a typical air-over-hydraulic brake system, -depr...

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6 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

heat form of energy in an internal combustion engine motion heat energy produced by engine combustion is converted to in stopping a vehicle, the energy of motion turns the vehicle's wheels, the wheels wont go anywhere unless theres ______ between the tires and the road surface traction what is a car engine heat conversion machine, taking the energy of heat from exploding mixture of fuel and air in the combustion chamber and converting it to motion through the engine cra...

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19 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

Which of the following is the best practice when instructed to block the wheels on a tractor/trailer combination? Place a pair of wedged wheel chocks on one tractor drive axle and one trailer axle wheel. What is the required amount of slack adjuster free travel on a properly adjusted, manual S-cam brake? 3/8 to 5/8 inch Which of the following foundation brake components are lubricated with chassis grease, either for component life or as part of a lube job? S-cam bushings ...

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8 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

The vehicle expections report the VIR should be submitted? Weekly Which of the following cannot a drum on an air braked vehicle to overheat? Too-high governor cut out pressure All the brakes drag on a truck with hydraulic brakes which of the following could be the cause? No brake pedal free travel Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? And out-of-round brake drum Air pressure gauge charge an air pressure signal...

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3 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

Which of the following air brake system components functions as a lever? the slack adjuster Which of the following components sets the system cut-in and cut-out pressures? the governor What is the function of a system safety pop-off valve? It relieves pressure from the supply tank in the event of governor cut-out failure. The function of the foot valve or dual-circuit application valve is to: meter air to the service brake circuit The potential energy of an air br...

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7 pages

Written in 2023/2024

Grade A

BRAINBOOSTERS

AN ENGINE BRAKE (JACOBS BRAKE) A. IS A SELF-ENERGIZING SERVO TYPE. B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) B. A SAFETY VALVE. C. A MODULATOR VALVE. (NOT CORRECT AWNSER) D. A RELAY VALVE. ...

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27 pages

Written in 2023/2024

Grade A

BRAINBOOSTERS

AN ENGINE BRAKE (JACOBS BRAKE) A. IS A SELF-ENERGIZING SERVO TYPE. B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) B. A SAFETY VALVE. C. A MODULATOR VALVE. (NOT CORRECT AWNSER) D. A RELAY VALVE. ...

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27 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

When a truck has no air pressure in its tanks, which warning devices are activated when the ignition key is turned on? A buzzer, a dash gauge and a red light What legislation mandates every required standard of a highway truck air brake system? FMVSS 121 If a truck is FMVSS 121 compliant, which of the following air reservoirs must be incorporated into the air brake circuit? Supply, primary and secondary tanks In a truck air brake system which sub circuit is primarily resp...

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13 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

in the AL factor the L refers to the? length of the slack adjuster Spring brakes on an air-brake vehicle must be able to hold the vehicle, facing uphill or downhill, on what percentage grade? B 20% How much free movement should exist between a slack adjuster and its camshaft? .005 in. max The warning light on a truck with a antilock brake system light when the truck is started. When the truck is moving, the light stays on. which of the following could be the cause? Misad...

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7 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

When a truck has no air pressure in its tanks, which warning devices are activated when the ignition key is turned on? A buzzer, a dash gauge and a red light What legislation mandates every required standard of a highway truck air brake system? FMVSS 121 If a truck is FMVSS 121 compliant, which of the following air reservoirs must be incorporated into the air brake circuit? Supply, primary and secondary tanks In a truck air brake system which sub circuit is primarily resp...

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13 pages

Written in 2023/2024

Grade A

BRAINBOOSTERS

Where should grease be applied on an S-cam brake system components? cam roller pocket race What is the primary function of a relay valve? remote controlled service brake valve Which of the following factors can affect the timing of service brakes? relay valve crack pressures hose and tubing diameters and length replacing a 45-degree fitting with a 90-degree fitting What is the potential energy of an air brake system? compressed air What are S-cam type foundation...

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6 pages

Written in 2023/2024

Grade A+

BRAINBOOSTERS

CDL Air Brake Practice Test|Complete Questions with A+ Graded Answers The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: a. Fluid pressure b. Spring pressure c. Air pressure d. Any of the above b. Spring pressure A straight truck or bus air brake system should not leak at a rate of more than __ psi per minute with the engine off and the brake released. a. 1 b. 2 c. 3 d. 4 c. 3 Your vehicle has dual air...

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6 pages

Written in 2023/2024

Grade A+

MedTestPro

Aumt Brake Final Exam |Complete Questions with Graded A+ Answers Tech A says that parking brakes on drum brake vehicles use separate brake shoes for backup in an emergency. Tech B says that parking brakes on drum brake vehicles mechanically operate the standard drum brake shoes. Who iscorrect? Tech B Which of these drum brake systems uses servo action in both directions? Duo-servo drum brake systems Tech A says that brake shoe linings saturated with brake fluid from a leaky wheel cy...

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12 pages

Written in 2023/2024

Grade A+

MedTestPro

Final Exam for Brakes Questions and Answers Graded A+ FMVSS Federal Motor Vehicle Safety Standard Antilock Braking Systems To prevent wheel lockup during excessive braking Kinetic Energy The energy in mass in motion Leverage To increase mechanical force and transfer it to the booster Compensating Port The port in the master cylinder that access fluid return to the reservoir

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2 pages

Written in 2023/2024

Grade A+

MedTestPro

HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE Graded A+ AN ENGINE BRAKE (JACOBS BRAKE) A. IS A SELF-ENERGIZING SERVO TYPE. B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) B. A SAFETY VALVE. C. A MOD...

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7 pages

Written in 2023/2024

Grade A+

MedTestPro

CDL Air Brakes |Complete Questions with Graded A+ Answers After every working day Oil and water usually collect in compresed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? Why drain water from the compressed air tanks? Water can freeze in cold weather and cause brake failure. The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi per minute with the engine off and the brakes released. 2 ...

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12 pages

Written in 2023/2024

Grade A+

MedTestPro

CDL Air Brakes |Complete Questions with Graded A+ Answers Air loss in a straight truck or bus should not be more than how much PSI with the engine off and the brakes on? 3 PSI in one minute To make an emergency stop with air brakes, using the stab braking method, you should Brake as hard as you can get off brakes when wheels lock get back on brakes when wheels start rolling again All vehicles with air brakes must have what signal? Low air pressure warning signal It is ac...

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8 pages

Written in 2023/2024

Grade A+

MedTestPro

Michigan CDL Air Brakes Exam Complete Questions with Graded A+ Correct Answers 3 different braking systems that make up Air Brakes Service Brake, Parking Brake, Emergency Brake Air Compressor Pumps air into storage tanks and connected to the engine via gears or a v-belt. Air Compressor Governor Controls when the air compressor will pump air into the air storage tanks. When tank pressure rises to the cut-out level, the governor stops the compressor from pumping. When the tank pressu...

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4 pages

Written in 2023/2024

Grade A+

MedTestPro

ASE BRAKES Exam #1|Complete Answers Graded A+ A A drum is chattering on the brake lathe. This could be the result of: A. Failure to install the dampening belt. B. Cutting too slowly. C. Dull cutting blades. D. Cutting speed too fast. C A vehicle is equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of the following could be the cause? A. Low brake fluid B. Air in the brake fluid C. Low power steering fluid D. An overtightened power steerin...

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7 pages

Written in 2023/2024

Grade A+

MedTestPro

T4 ASE Brakes Exam with complete Graded A+ solutions Psi loss rate for Straight Truck 2 psi/minute Psi loss rate for combination vehicle less than 3 psi/minute Service Brake Pressure Drop Test Apply service brake to 90 psi. Loss rate should be less than 3 psi/minute for straight vehicles and less than 4 psi/minute for combination vehicles. Improperly adjusted brake shoes Cause 1) brake imbalance 2) increased stopping distance 3) excessive heat and wear Instability a...

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9 pages

Written in 2023/2024

Grade A+

MedTestPro