CDL Air Brakes Test CORRECT 100%
If your vehicle has an alcohol evaporator, it is there to:
A. Rid the wet tank of alcohol that condenses and sits at the bottom
B. Eliminate the need for daily tank draining
C. Reduce the risk of ice in air brake valves in cold weather - ANSWER C. Reduce the
risk of ice in air brake valves in cold weather.
The application pressure gauge shows how much air pressure you:
A. Have in the air tanks
B. Have in the modulating control valve
C. Are applying to the brakes - ANSWER C. Are applying to the brakes
The most important thing you do when a low air pressure warning comes on is:
A. Upshift
B. Downshift
C. Stop safely and park as soon as possible - ANSWER C. Stop safely and park as
soon as possible
Your vehicle has a dual air brake system. If a low air pressure warning comes on for the
secondary system, you should:
A. Bring your vehicle to a safe stop and continue only when the system is fixed
B. Reduce your speed and test the remaining system while under way
C. Reduce your speed and drive to the nearest garage for repairs - ANSWER A. Bring
your vehicle to a safe stop and continue only when the system is fixed
If your truck has a properly functioning dual air brake system and minimum size air
tanks, the air pressure should build from 85 to 100 psi within ____ seconds.
A. 30
B. 45
C. 60 - ANSWER B. 45
How should you check that your service brakes are working properly?
A. Park on a slight incline, drain off air pressure, set parking brakes, and check for
movement
B. Park on level ground, chock the wheels, engage the parking brake when you have
the correct amount of air pressure to do so, and shit the engine off
C. Park on level ground, wait for normal air pressure, release the parking brake, move
the truck forward slowly (about 5 mph) and apply the brakes firmly using the brake
pedal - ANSWER C. Park on level ground, wait for normal air pressure, release the
parking brake, move the truck forward slowly (about 5 mph) and apply the brakes firmly
using the brake pedal
If you must make an emergency stop, brake so you:
A. Can steer hard while braking hard
, B. Use the hand brake first
C. Can steer and your vehicle stays in a straight line - ANSWER C. Can steer and your
vehicle stays in a straight line
When the brakes are applied, the brake shoes (or linings) are pressed against the:
A. Brake drum or disc
B. Slack adjuster
C. S-cam - ANSWER A. Brake drum or disc
Under ideal conditions, a truck with air brakes going 55 mph would require a stopping
distance of:
A. Less than 100 feet
B. 100-300 feet
C. More than 300 feet - ANSWER C. More than 300 feet
The use of air brakes on a long and/or steep downgrade under normal conditions is only
a supplement to:
A. The use of spring brakes
B. The use of the front brake limiting valve
C. The brake effect of the engine - ANSWER C. The brake effect of the engine
If your truck's air compressor has its own oil supply, when should you first check the oil
level?
A. Before driving
B. During your first en route inspection
C. Immediately after stopping - ANSWER A. Before driving
Emergency stab braking is when you:
A. Press hard on the brake pedal and apply full hand valve until you stop
B. Use light steady pressure on the brake pedal
C. Brake as hard as you can, release the brakes when the wheels lock, put on the
brakes again when the - ANSWER C. Brake as hard as you can, release the brakes
when the wheels lock, put on the brakes again when the wheels start rolling.
If air pressure does not build up to normal within the correct amount of time, then:
A. You should be ready to use your parking brake
B. The alcohol container may be low
C. Your air pressure may drop too low during driving, requiring an emergency stop -
ANSWER C. Your air pressure may drop too low during driving, requiring an
emergency stop
Which of these is not a proper time to apply parking brakes?
A. If you will only be stopped for less than one hour
B. If you are going to test the parking brake to make sure that it holds the vehicle
If your vehicle has an alcohol evaporator, it is there to:
A. Rid the wet tank of alcohol that condenses and sits at the bottom
B. Eliminate the need for daily tank draining
C. Reduce the risk of ice in air brake valves in cold weather - ANSWER C. Reduce the
risk of ice in air brake valves in cold weather.
The application pressure gauge shows how much air pressure you:
A. Have in the air tanks
B. Have in the modulating control valve
C. Are applying to the brakes - ANSWER C. Are applying to the brakes
The most important thing you do when a low air pressure warning comes on is:
A. Upshift
B. Downshift
C. Stop safely and park as soon as possible - ANSWER C. Stop safely and park as
soon as possible
Your vehicle has a dual air brake system. If a low air pressure warning comes on for the
secondary system, you should:
A. Bring your vehicle to a safe stop and continue only when the system is fixed
B. Reduce your speed and test the remaining system while under way
C. Reduce your speed and drive to the nearest garage for repairs - ANSWER A. Bring
your vehicle to a safe stop and continue only when the system is fixed
If your truck has a properly functioning dual air brake system and minimum size air
tanks, the air pressure should build from 85 to 100 psi within ____ seconds.
A. 30
B. 45
C. 60 - ANSWER B. 45
How should you check that your service brakes are working properly?
A. Park on a slight incline, drain off air pressure, set parking brakes, and check for
movement
B. Park on level ground, chock the wheels, engage the parking brake when you have
the correct amount of air pressure to do so, and shit the engine off
C. Park on level ground, wait for normal air pressure, release the parking brake, move
the truck forward slowly (about 5 mph) and apply the brakes firmly using the brake
pedal - ANSWER C. Park on level ground, wait for normal air pressure, release the
parking brake, move the truck forward slowly (about 5 mph) and apply the brakes firmly
using the brake pedal
If you must make an emergency stop, brake so you:
A. Can steer hard while braking hard
, B. Use the hand brake first
C. Can steer and your vehicle stays in a straight line - ANSWER C. Can steer and your
vehicle stays in a straight line
When the brakes are applied, the brake shoes (or linings) are pressed against the:
A. Brake drum or disc
B. Slack adjuster
C. S-cam - ANSWER A. Brake drum or disc
Under ideal conditions, a truck with air brakes going 55 mph would require a stopping
distance of:
A. Less than 100 feet
B. 100-300 feet
C. More than 300 feet - ANSWER C. More than 300 feet
The use of air brakes on a long and/or steep downgrade under normal conditions is only
a supplement to:
A. The use of spring brakes
B. The use of the front brake limiting valve
C. The brake effect of the engine - ANSWER C. The brake effect of the engine
If your truck's air compressor has its own oil supply, when should you first check the oil
level?
A. Before driving
B. During your first en route inspection
C. Immediately after stopping - ANSWER A. Before driving
Emergency stab braking is when you:
A. Press hard on the brake pedal and apply full hand valve until you stop
B. Use light steady pressure on the brake pedal
C. Brake as hard as you can, release the brakes when the wheels lock, put on the
brakes again when the - ANSWER C. Brake as hard as you can, release the brakes
when the wheels lock, put on the brakes again when the wheels start rolling.
If air pressure does not build up to normal within the correct amount of time, then:
A. You should be ready to use your parking brake
B. The alcohol container may be low
C. Your air pressure may drop too low during driving, requiring an emergency stop -
ANSWER C. Your air pressure may drop too low during driving, requiring an
emergency stop
Which of these is not a proper time to apply parking brakes?
A. If you will only be stopped for less than one hour
B. If you are going to test the parking brake to make sure that it holds the vehicle
