Truck Driving Test Questions (Air Brakes). All Revision Questions and Correct Answers
(Already Graded A+) (2024 Update) 100% Guaranteed
The application pressure gauge shows how much air pressure you: - ANSWER- 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 ______________ - ANSWER- 20 p.s.i.
Some air brake systems have an alcohol evaporator. What may happen if you dont keep the proper
level of an alcohol? - ANSWER- Ice may form in the storage tank and cause a brake failure.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one
system, What should you do? - ANSWER- Bring your vehicle to a complete stop right away
and safely park. Continue only after the system is fixed.
Why drain water from compressed air tanks? - ANSWER- Water can freeze in cold weather
and cause brake failure.
The safety valve is set automatically when pressure is: - 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.
Parking or emergency brakes of trucks and buses can be legally held on by _____ pressure. -
ANSWER- Spring
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 up from 85 to 100 psi within how many seconds? - ANSWER- 45
How should you check that your service brakes are working properly? - ANSWER- Park on
level ground. Wait until normal air pressure is reached. Release the parking brake and move
forward slowly at about 5 mph. Then apply the brakes firmly using the brake.
A straight truck or bus air brake system should NOT leak at the rate of more than ______ psi per
minute with the engine off and the brakes released. - ANSWER- 2
During normal driving, spring brakes are usually held back by: - ANSWER- Air pressure
The air compressor stops pumping air at what p.s.i.? - ANSWER- 125
The driver must be able to see a low air pressure warning which comes on before pressure in the
service air tanks falls below ____ psi. - ANSWER- 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
If you must make an emergency stop, you should brake so you can ____________________ -
ANSWER- steer and so your your vehicle stays in a straight line.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one
system. What should you do? - ANSWER- Stop right away and safely park. Continue only after
the system is fixed.
(Already Graded A+) (2024 Update) 100% Guaranteed
The application pressure gauge shows how much air pressure you: - ANSWER- 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 ______________ - ANSWER- 20 p.s.i.
Some air brake systems have an alcohol evaporator. What may happen if you dont keep the proper
level of an alcohol? - ANSWER- Ice may form in the storage tank and cause a brake failure.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one
system, What should you do? - ANSWER- Bring your vehicle to a complete stop right away
and safely park. Continue only after the system is fixed.
Why drain water from compressed air tanks? - ANSWER- Water can freeze in cold weather
and cause brake failure.
The safety valve is set automatically when pressure is: - 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.
Parking or emergency brakes of trucks and buses can be legally held on by _____ pressure. -
ANSWER- Spring
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 up from 85 to 100 psi within how many seconds? - ANSWER- 45
How should you check that your service brakes are working properly? - ANSWER- Park on
level ground. Wait until normal air pressure is reached. Release the parking brake and move
forward slowly at about 5 mph. Then apply the brakes firmly using the brake.
A straight truck or bus air brake system should NOT leak at the rate of more than ______ psi per
minute with the engine off and the brakes released. - ANSWER- 2
During normal driving, spring brakes are usually held back by: - ANSWER- Air pressure
The air compressor stops pumping air at what p.s.i.? - ANSWER- 125
The driver must be able to see a low air pressure warning which comes on before pressure in the
service air tanks falls below ____ psi. - ANSWER- 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
If you must make an emergency stop, you should brake so you can ____________________ -
ANSWER- steer and so your your vehicle stays in a straight line.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one
system. What should you do? - ANSWER- Stop right away and safely park. Continue only after
the system is fixed.
