Texas CDL - Air Brake Test exam (Latest
2025) |complete guide with questions
and verified answers|get it 100% correct
Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when
should you drain the air tanks? - CORRECT ANSWERS After working every day.
Why drain water from the compressed air tanks? - CORRECT ANSWERS Water
can freeze in cold weather and cause brake failure.
The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi
per minute with the engine off and the brakes released. - CORRECT ANSWERS 2
To make an emergency stop with air brakes, using the stab braking method, you should: - CORRECT
ANSWERS 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 when your brakes are fading when: - CORRECT ANSWERS You
have to press the brake pedal harder to control speed on a downgrade.
If the air compressor should develop a leak, what keeps the air in the tanks? - CORRECT ANSWERS
The one way check valve.
To check the brake slack on S-cam brakes you should park on: - CORRECT ANSWERS
Park on level ground, chock the wheels, and release the parking brakes.
The application pressure gauge shows how much pressure you have: - CORRECT ANSWERS
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. - CORRECT ANSWERS 20
The safety valve is set to automatically reduce pressure at _________ psi. - CORRECT ANSWERS
150
Your truck has a dual air system and one of the system loses its pressure. What will happen? - CORRECT
ANSWERS Either the front or back brake will not be fully operational.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: -
CORRECT ANSWERS 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 psi within ________ seconds? - CORRECT ANSWERS
45
During normal driving, spring brakes are usually held back by: - CORRECT ANSWERS
Air Pressure
The air compressor stops pumping air at what psi? - CORRECT ANSWERS 125
The driver must be able to see a warning before pressure in the service air tanks falls below ________
psi. - CORRECT ANSWERS 55
Excessive use of the service brakes results in overheating which can lead to: - CORRECT ANSWERS
Expansion of the brake drums.
The most common type of foundation brakes found on heavy vehicles is the: - CORRECT ANSWERS
S-cam drum
2025) |complete guide with questions
and verified answers|get it 100% correct
Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when
should you drain the air tanks? - CORRECT ANSWERS After working every day.
Why drain water from the compressed air tanks? - CORRECT ANSWERS Water
can freeze in cold weather and cause brake failure.
The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi
per minute with the engine off and the brakes released. - CORRECT ANSWERS 2
To make an emergency stop with air brakes, using the stab braking method, you should: - CORRECT
ANSWERS 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 when your brakes are fading when: - CORRECT ANSWERS You
have to press the brake pedal harder to control speed on a downgrade.
If the air compressor should develop a leak, what keeps the air in the tanks? - CORRECT ANSWERS
The one way check valve.
To check the brake slack on S-cam brakes you should park on: - CORRECT ANSWERS
Park on level ground, chock the wheels, and release the parking brakes.
The application pressure gauge shows how much pressure you have: - CORRECT ANSWERS
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. - CORRECT ANSWERS 20
The safety valve is set to automatically reduce pressure at _________ psi. - CORRECT ANSWERS
150
Your truck has a dual air system and one of the system loses its pressure. What will happen? - CORRECT
ANSWERS Either the front or back brake will not be fully operational.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: -
CORRECT ANSWERS 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 psi within ________ seconds? - CORRECT ANSWERS
45
During normal driving, spring brakes are usually held back by: - CORRECT ANSWERS
Air Pressure
The air compressor stops pumping air at what psi? - CORRECT ANSWERS 125
The driver must be able to see a warning before pressure in the service air tanks falls below ________
psi. - CORRECT ANSWERS 55
Excessive use of the service brakes results in overheating which can lead to: - CORRECT ANSWERS
Expansion of the brake drums.
The most common type of foundation brakes found on heavy vehicles is the: - CORRECT ANSWERS
S-cam drum
