CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
During normal driving, spring brakes are usually held back by:
a. Bolts
b. Air Pressure
c. Spring pressure
d. Centrifugal force - ANSWERS-b. Air Pressure
Total stopping distance for air brakes is longer than for hydraulic brakes
due to _______ distance.
a. Perception
b. Reaction
c. Brake lag
d. Effective braking - ANSWERS-c. Brake lag
The most common type of foundation brake found on heavy vehicles is
the:
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1
, CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
a. Disc.
b. Wedge drum.
c. S-cam.
d. None of the above. - ANSWERS-c. S-cam.
The air loss rate for a straight truck or bus with the engine off and the
brakes on should be more than:
a. 1 psi in 30 seconds.
b. 1 psi in 1 minute.
c. 2 psi in 45 seconds.
d. 3 psi in 1 minute. - ANSWERS-d. 3 psi in 1 minute.
The supply pressure gauge shows how much pressure:
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2
, CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
a. You have used in this trip.
b. Is in the air tanks.
c. Is going to the brake chambers.
d. The air can take. - ANSWERS-b. Is in the air tanks.
The brake system that applies and releases the brakes when the driver
uses the pedal is the ________ brake system.
a. Emergency.
b. Service.
c. Parking.
d. None of the above. - ANSWERS-b. Service.
The important thing to do when a low air pressure warning comes on is
to:
a. Up-shift
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3
, CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
b. Down-shift
c. Adjust the brake pedal
d. Stop and safely park as soon as possible. - ANSWERS-d. Stop and
safely park as soon as possible.
All vehicles with air brakes are required to have a low pressure warning
signal. This could be...
A) a red light
B) a wig wag mechanical arm
C) a buzzer
D) any of the above - ANSWERS-D
To test the low pressure warning signal, you should do all BUT the
following...
A) shut the engine off
B) turn the electrical power on
C) ask a friend to listen for the signal
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PAGE
4
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
During normal driving, spring brakes are usually held back by:
a. Bolts
b. Air Pressure
c. Spring pressure
d. Centrifugal force - ANSWERS-b. Air Pressure
Total stopping distance for air brakes is longer than for hydraulic brakes
due to _______ distance.
a. Perception
b. Reaction
c. Brake lag
d. Effective braking - ANSWERS-c. Brake lag
The most common type of foundation brake found on heavy vehicles is
the:
END OF
PAGE
1
, CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
a. Disc.
b. Wedge drum.
c. S-cam.
d. None of the above. - ANSWERS-c. S-cam.
The air loss rate for a straight truck or bus with the engine off and the
brakes on should be more than:
a. 1 psi in 30 seconds.
b. 1 psi in 1 minute.
c. 2 psi in 45 seconds.
d. 3 psi in 1 minute. - ANSWERS-d. 3 psi in 1 minute.
The supply pressure gauge shows how much pressure:
END OF
PAGE
2
, CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
a. You have used in this trip.
b. Is in the air tanks.
c. Is going to the brake chambers.
d. The air can take. - ANSWERS-b. Is in the air tanks.
The brake system that applies and releases the brakes when the driver
uses the pedal is the ________ brake system.
a. Emergency.
b. Service.
c. Parking.
d. None of the above. - ANSWERS-b. Service.
The important thing to do when a low air pressure warning comes on is
to:
a. Up-shift
END OF
PAGE
3
, CDL CLASS A AIR LATEST
BRAKES EXAM
QUESTIONS AND
ANSWERS 2026 – 2027
b. Down-shift
c. Adjust the brake pedal
d. Stop and safely park as soon as possible. - ANSWERS-d. Stop and
safely park as soon as possible.
All vehicles with air brakes are required to have a low pressure warning
signal. This could be...
A) a red light
B) a wig wag mechanical arm
C) a buzzer
D) any of the above - ANSWERS-D
To test the low pressure warning signal, you should do all BUT the
following...
A) shut the engine off
B) turn the electrical power on
C) ask a friend to listen for the signal
END OF
PAGE
4
