© EVERLY 2025 ALL RIGHTS RESERVED.
Air Brakes Test Questions And Answers
100% Pass.
Oil & water usually collect in compressed air tanks. If you do NOT have an automatic tank
drain, when should you drain the air tanks - Answer✔a. After every working day.
b. After every four hours of service.
c. Once a week.
d. Every other week.
Correct Answer: After every working day.
Why drain water from the compressed air tanks? - Answer✔Water can freeze in cold weather
and cause brake failure.
The air brakes system for a straight truck or bus should not leak at a rate of more than ___ psi per
minute with the engine off & the brakes released - Answer✔2
To make an emergency stop with air brakes, using the stab braking method, you should: -
Answer✔Press on the brake pedal as hard as you can, release the brakes when the wheels locked,
put on the brakes again when the wheels start rolling.
You should know that your brakes are fading when: - Answer✔You have to push harder on the
brake pedal to control your speed on a downgrade.
If the air compressor should develop a leak, what keeps the air in the tanks? - Answer✔The one
way check valve
To check the brake slack on S-cam brakes you should park on - Answer✔Park on level ground,
chock the wheels, and release the parking brakes
The application pressure gauge shows how much air pressure you: - Answer✔When you are
applying to the brakes
The spring brakes used on the chambers in a straight truck will bring you to a stop when air
pressure drops below ___ psi - Answer✔20
The safety valve is set to automatically reduce pressure at ___ psi - Answer✔150
Your truck has a dual air system and one of the system loses its pressure, what will happen -
Answer✔Either the front or back brake will not be fully operational.
, © EVERLY 2025 ALL RIGHTS RESERVED.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank
to: - Answer✔Release the spring emergency/parking brakes to move a short distance.
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 within ____ seconds - Answer✔45
During normal driving, spring brakes are usually held back by: - Answer✔air pressure
The air compressor stops pumping air at what psi - Answer✔125
The driver must be able to see a warning before pressure in the service air tanks falls below ___
psi - Answer✔55 or 60
Excessive use of the service brakes results in overheating which can lead to -
Answer✔Expansion of the brake drums
The most common type of foundation brake found on heavy vehicles is the - Answer✔S-cam
drum brake
If you must make an emergency stop, brake so you: - Answer✔Can steer and your vehicle stays
in a straight line.
The braking power of the spring brakes - Answer✔Depends on the service brakes being in
adjustment
The air brakes lag distance at 55mph on dry pavement adds about ___ feet - Answer✔32 ft
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ___ distance
- Answer✔Brake lag
It is accepted that too much heat caused by using your brakes too often can also cause: -
Answer✔Brake fade or failure
Repeatedly pressing and releasing (fanning) the brake pedal may result in: - Answer✔The loss of
brake air pressure
The brake system that applies and releases the brakes when the driver uses the brake pedal is the
________ brake system. - Answer✔service
A slack adjuster's free play need to be adjusted if it is more than about ___ how many inches
when you pull hard on it - Answer✔1 inch
An air brake system is fully charged at what psi? - Answer✔125
The brake pedal in an air brake system - Answer✔Controls the air pressure applied to put on the
brakes
The S-cam - Answer✔Forces the brake shoes against the inside of the brake drum
Under normal conditions in order to engage the parking brakes the driver must first -
Answer✔Let the air out of the spring brakes.
Air Brakes Test Questions And Answers
100% Pass.
Oil & water usually collect in compressed air tanks. If you do NOT have an automatic tank
drain, when should you drain the air tanks - Answer✔a. After every working day.
b. After every four hours of service.
c. Once a week.
d. Every other week.
Correct Answer: After every working day.
Why drain water from the compressed air tanks? - Answer✔Water can freeze in cold weather
and cause brake failure.
The air brakes system for a straight truck or bus should not leak at a rate of more than ___ psi per
minute with the engine off & the brakes released - Answer✔2
To make an emergency stop with air brakes, using the stab braking method, you should: -
Answer✔Press on the brake pedal as hard as you can, release the brakes when the wheels locked,
put on the brakes again when the wheels start rolling.
You should know that your brakes are fading when: - Answer✔You have to push harder on the
brake pedal to control your speed on a downgrade.
If the air compressor should develop a leak, what keeps the air in the tanks? - Answer✔The one
way check valve
To check the brake slack on S-cam brakes you should park on - Answer✔Park on level ground,
chock the wheels, and release the parking brakes
The application pressure gauge shows how much air pressure you: - Answer✔When you are
applying to the brakes
The spring brakes used on the chambers in a straight truck will bring you to a stop when air
pressure drops below ___ psi - Answer✔20
The safety valve is set to automatically reduce pressure at ___ psi - Answer✔150
Your truck has a dual air system and one of the system loses its pressure, what will happen -
Answer✔Either the front or back brake will not be fully operational.
, © EVERLY 2025 ALL RIGHTS RESERVED.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank
to: - Answer✔Release the spring emergency/parking brakes to move a short distance.
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 within ____ seconds - Answer✔45
During normal driving, spring brakes are usually held back by: - Answer✔air pressure
The air compressor stops pumping air at what psi - Answer✔125
The driver must be able to see a warning before pressure in the service air tanks falls below ___
psi - Answer✔55 or 60
Excessive use of the service brakes results in overheating which can lead to -
Answer✔Expansion of the brake drums
The most common type of foundation brake found on heavy vehicles is the - Answer✔S-cam
drum brake
If you must make an emergency stop, brake so you: - Answer✔Can steer and your vehicle stays
in a straight line.
The braking power of the spring brakes - Answer✔Depends on the service brakes being in
adjustment
The air brakes lag distance at 55mph on dry pavement adds about ___ feet - Answer✔32 ft
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ___ distance
- Answer✔Brake lag
It is accepted that too much heat caused by using your brakes too often can also cause: -
Answer✔Brake fade or failure
Repeatedly pressing and releasing (fanning) the brake pedal may result in: - Answer✔The loss of
brake air pressure
The brake system that applies and releases the brakes when the driver uses the brake pedal is the
________ brake system. - Answer✔service
A slack adjuster's free play need to be adjusted if it is more than about ___ how many inches
when you pull hard on it - Answer✔1 inch
An air brake system is fully charged at what psi? - Answer✔125
The brake pedal in an air brake system - Answer✔Controls the air pressure applied to put on the
brakes
The S-cam - Answer✔Forces the brake shoes against the inside of the brake drum
Under normal conditions in order to engage the parking brakes the driver must first -
Answer✔Let the air out of the spring brakes.
