CDL Air Brake Practice Test Questions and Answers Rated A
The parking or emergency brake on a heavy vehicle can
only be held in position by something that cannot leak
away, like:
b. Spring pressure
a. Fluid pressure
b. Spring pressure
c. Air pressure
d. Any of the above
A straight truck or bus air brake system should not leak at
a rate of more than psi per minute with the engine ott
and the brake released.
c. 3
a. 1
b. 2
c. 3
d. 4
Your vehicle has dual air brake system. If low air pressure
warning comes on for the secondary system or for one
system, you should:
a. Bring the vehicle to a safe stop and continue only when
the system is fixed. a. Bring the vehicle to a safe stop and continue only when
b. Reduce your speed, and test the remaining system the system is fixed.
while under-way.
c. Reduce your speed, and drive to the nearest garage for
repairs.
d. Continue at normal speed if only the secondary system
fails.
If your vehicle has an alcohol evaporator, it is there to:
a. Rid the wet tank of alcohol that condenses and sits at
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, CDL Air Brake Practice Test Questions and Answers Rated A
the bottom.
b. Eliminate the need for daily tank draining.
c. Boost tank pressure the same way that superchargers d. Reduce the risk of ice in the air brake valves in cold
boost engines. weather.
d. Reduce the risk of ice in the air brake valves in cold
weather.
Air braking takes more time than hydraulic because air:
a. Brakes use ditterent brake drums.
b. Takes more time to flow through the lines than hydraulic
b. Takes more time to flow through the lines than hydraulic
fluid.
fluid.
c. Brakes require heavier return springs.
d. Is always leaking through airline fittings.
The brake pedal in an air brake system:
a. Controls the speed of the air compressor.
b. Always needs to be held down halfway during normal
c. Controls the air pressure applied to put on the brakes.
driving.
c. Controls the air pressure applied to put on the brakes.
d. Is connected to slack adjusters by a series of rods and
linkages.
With air brake vehicles, the parking brakes should be
used:
a. Whenever you leave the vehicle unattended. a. Whenever you leave the vehicle unattended.
b. To hold your speed when going downhill.
c. As little as possible.
d. Only during pre and post-trip inspections.
For emergency stab braking, you should:
a. Pump the brake pedal rapidly and lightly.
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The parking or emergency brake on a heavy vehicle can
only be held in position by something that cannot leak
away, like:
b. Spring pressure
a. Fluid pressure
b. Spring pressure
c. Air pressure
d. Any of the above
A straight truck or bus air brake system should not leak at
a rate of more than psi per minute with the engine ott
and the brake released.
c. 3
a. 1
b. 2
c. 3
d. 4
Your vehicle has dual air brake system. If low air pressure
warning comes on for the secondary system or for one
system, you should:
a. Bring the vehicle to a safe stop and continue only when
the system is fixed. a. Bring the vehicle to a safe stop and continue only when
b. Reduce your speed, and test the remaining system the system is fixed.
while under-way.
c. Reduce your speed, and drive to the nearest garage for
repairs.
d. Continue at normal speed if only the secondary system
fails.
If your vehicle has an alcohol evaporator, it is there to:
a. Rid the wet tank of alcohol that condenses and sits at
1/9
, CDL Air Brake Practice Test Questions and Answers Rated A
the bottom.
b. Eliminate the need for daily tank draining.
c. Boost tank pressure the same way that superchargers d. Reduce the risk of ice in the air brake valves in cold
boost engines. weather.
d. Reduce the risk of ice in the air brake valves in cold
weather.
Air braking takes more time than hydraulic because air:
a. Brakes use ditterent brake drums.
b. Takes more time to flow through the lines than hydraulic
b. Takes more time to flow through the lines than hydraulic
fluid.
fluid.
c. Brakes require heavier return springs.
d. Is always leaking through airline fittings.
The brake pedal in an air brake system:
a. Controls the speed of the air compressor.
b. Always needs to be held down halfway during normal
c. Controls the air pressure applied to put on the brakes.
driving.
c. Controls the air pressure applied to put on the brakes.
d. Is connected to slack adjusters by a series of rods and
linkages.
With air brake vehicles, the parking brakes should be
used:
a. Whenever you leave the vehicle unattended. a. Whenever you leave the vehicle unattended.
b. To hold your speed when going downhill.
c. As little as possible.
d. Only during pre and post-trip inspections.
For emergency stab braking, you should:
a. Pump the brake pedal rapidly and lightly.
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