CDL AIR BRAKE PRACTICE TEST ACTUAL CDL AIR BRAKE PRACTICE TEST ACTUAL
QUESTIONS AND ANSWERS [CORRECTLY QUESTIONS AND ANSWERS [CORRECTLY
ANSWERED] UPDATED VERSION ANSWERED] UPDATED VERSION
a. Controls the speed of the air compressor.
The parking or emergency brake on a heavy vehicle can only be held in position by b. Always needs to be held down halfway during normal driving.
something that cannot leak away, like: c. Controls the air pressure applied to put on the brakes.
d. Is connected to slack adjusters by a series of rods and linkages. - correct answersc.
a. Fluid pressure Controls the air pressure applied to put on the brakes.
b. Spring pressure
c. Air pressure With air brake vehicles, the parking brakes should be used:
d. Any of the above - correct answersb. Spring pressure
a. Whenever you leave the vehicle unattended.
A straight truck or bus air brake system should not leak at a rate of more than __ psi per b. To hold your speed when going downhill.
minute with the engine off and the brake released. c. As little as possible.
d. Only during pre and post-trip inspections. - correct answersa. Whenever you leave
a. 1 the vehicle unattended.
b. 2
c. 3 For emergency stab braking, you should:
d. 4 - correct answersc. 3
a. Pump the brake pedal rapidly and lightly.
Your vehicle has dual air brake system. If low air pressure warning comes on for the b. Press on the brake pedal as hard as you can, release the brakes when the wheels
secondary system or for one system, you should: lock, and when the wheels start rolling put on the brakes fully again.
c. Brake hard until the wheels lock, then get off the brakes for as much time as the
a. Bring the vehicle to a safe stop and continue only when the system is fixed. wheels were locked.
b. Reduce your speed, and test the remaining system while under-way. d. Press hard on the brake pedal and apply full hand valve until you stop. - correct
c. Reduce your speed, and drive to the nearest garage for repairs. answersb. Press on the brake pedal as hard as you can, release the brakes when the
d. Continue at normal speed if only the secondary system fails. - correct answersa. wheels lock, and when the wheels start rolling put on the brakes fully again.
Bring the vehicle to a safe stop and continue only when the system is fixed.
If your truck or bus has dual parking control valves, you can use pressure from a
If your vehicle has an alcohol evaporator, it is there to: separate tank to:
a. Rid the wet tank of alcohol that condenses and sits at the bottom. a. Release the spring emergency/ parking brakes to move a short distance.
b. Eliminate the need for daily tank draining. b. Apply more brake pressure if the main tank is getting low.
c. Boost tank pressure the same way that superchargers boost engines. c. Stay parked twice as long with your service air pressure.
d. Reduce the risk of ice in the air brake valves in cold weather. - correct answersd. d. Balance the service brake system whenever you are parked. - correct answersa.
Reduce the risk of ice in the air brake valves in cold weather. Release the spring emergency/ parking brakes to move a short distance.
Air braking takes more time than hydraulic because air: Modern air brakes systems combine three different systems. They are the service,
parking, and the _________ brakes.
a. Brakes use different brake drums.
b. Takes more time to flow through the lines than hydraulic fluid. a. Emergency
c. Brakes require heavier return springs. b. Foot
d. Is always leaking through airline fittings. - correct answersb. Takes more time to flow c. S-cam
through the lines than hydraulic fluid. d. Drum - correct answersa. Emergency
The brake pedal in an air brake system: To check the free play of the manual slack adjusters on the S-cam brakes, you should
park on:
QUESTIONS AND ANSWERS [CORRECTLY QUESTIONS AND ANSWERS [CORRECTLY
ANSWERED] UPDATED VERSION ANSWERED] UPDATED VERSION
a. Controls the speed of the air compressor.
The parking or emergency brake on a heavy vehicle can only be held in position by b. Always needs to be held down halfway during normal driving.
something that cannot leak away, like: c. Controls the air pressure applied to put on the brakes.
d. Is connected to slack adjusters by a series of rods and linkages. - correct answersc.
a. Fluid pressure Controls the air pressure applied to put on the brakes.
b. Spring pressure
c. Air pressure With air brake vehicles, the parking brakes should be used:
d. Any of the above - correct answersb. Spring pressure
a. Whenever you leave the vehicle unattended.
A straight truck or bus air brake system should not leak at a rate of more than __ psi per b. To hold your speed when going downhill.
minute with the engine off and the brake released. c. As little as possible.
d. Only during pre and post-trip inspections. - correct answersa. Whenever you leave
a. 1 the vehicle unattended.
b. 2
c. 3 For emergency stab braking, you should:
d. 4 - correct answersc. 3
a. Pump the brake pedal rapidly and lightly.
Your vehicle has dual air brake system. If low air pressure warning comes on for the b. Press on the brake pedal as hard as you can, release the brakes when the wheels
secondary system or for one system, you should: lock, and when the wheels start rolling put on the brakes fully again.
c. Brake hard until the wheels lock, then get off the brakes for as much time as the
a. Bring the vehicle to a safe stop and continue only when the system is fixed. wheels were locked.
b. Reduce your speed, and test the remaining system while under-way. d. Press hard on the brake pedal and apply full hand valve until you stop. - correct
c. Reduce your speed, and drive to the nearest garage for repairs. answersb. Press on the brake pedal as hard as you can, release the brakes when the
d. Continue at normal speed if only the secondary system fails. - correct answersa. wheels lock, and when the wheels start rolling put on the brakes fully again.
Bring the vehicle to a safe stop and continue only when the system is fixed.
If your truck or bus has dual parking control valves, you can use pressure from a
If your vehicle has an alcohol evaporator, it is there to: separate tank to:
a. Rid the wet tank of alcohol that condenses and sits at the bottom. a. Release the spring emergency/ parking brakes to move a short distance.
b. Eliminate the need for daily tank draining. b. Apply more brake pressure if the main tank is getting low.
c. Boost tank pressure the same way that superchargers boost engines. c. Stay parked twice as long with your service air pressure.
d. Reduce the risk of ice in the air brake valves in cold weather. - correct answersd. d. Balance the service brake system whenever you are parked. - correct answersa.
Reduce the risk of ice in the air brake valves in cold weather. Release the spring emergency/ parking brakes to move a short distance.
Air braking takes more time than hydraulic because air: Modern air brakes systems combine three different systems. They are the service,
parking, and the _________ brakes.
a. Brakes use different brake drums.
b. Takes more time to flow through the lines than hydraulic fluid. a. Emergency
c. Brakes require heavier return springs. b. Foot
d. Is always leaking through airline fittings. - correct answersb. Takes more time to flow c. S-cam
through the lines than hydraulic fluid. d. Drum - correct answersa. Emergency
The brake pedal in an air brake system: To check the free play of the manual slack adjusters on the S-cam brakes, you should
park on:
