1.
The vehicle must have a warning device which comes on when the air pressure in the service air tanks falls below
2.
Which brake system applies and releases the brakes when the driver uses the brake pedal?
3.
Why should you not fan the brakes on and off during long downgrades?
4.
The purpose of engine retarders is to
5.
Air brake equipped vehicles must have
6.
Three different systems are found on modern air brake systems; service brakes, parking brakes, and the
7.
Which of the following is O.K. to find in the air brake system?
8.
The most common type of foundation brake found on heavy commercial vehicles is
9.
What turns on the electrical stop light switch in an air brake system?
10.
Which of the following answers is most correct about using brakes on a long and/or steep downgrade?
11.
During normal operations, the parking and emergency brakes are usually held back by
12.
If the air system should develop a leak, what will keep the air in the air tanks?
13.
What will determine how effective the spring emergency brakes or the parking brakes work?
14.
The air supply pressure gauge shows the driver how much pressure
15.
Air loss in a single vehicle (not a combination unit) should not be more than ______ with the engine off and the brakes on.
16.
The air compressor governor controls
17.
A straight truck or bus air brake system cannot leak more than ______ psi per minute with the engine off and the brakes released.
18.
In air brake equipped vehicles, you use the parking brakes when?
19.
You must make a quick emergency stop. You should brake so you
20.
When a failure occurs in the service brake system, the system you need to stop the vehicle is the
21.
To use the stab braking technique during emergency braking, you
22.
A combination vehicle air brake system cannot leak more than ______ psi per minute with the engine off and the brakes released.
23.
If your vehicle has an alcohol evaporator, it is there to
24.
If your vehicle is equipped with an alcohol evaporator, every day during the winter weather you should
25.
When using the parking brakes or emergency brakes, what type of pressure is being used?
26.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to
28.
The air loss rate for a straight truck or bus with the engine off and the brakes applied should not be more than
29.
Which of the following statements about brakes is true?
30.
How do you check the free play in manual slack adjusters?
Great job you’ve finished the Air Brakes CDL Practice test! Please enter your name and email. Your results will be presented on the next page. Feel free to retake the test as many times as you need to.
Worried about passing your CLP exam? As a student of a DRC network school, we’ll give you all of the resources needed to pass each section of the written CDL exam. Not enrolled yet? Learn more by calling 800-391-2754 or apply now.
Name
Email
Are you currently enrolled in CDL School?
Are you interested in receiving more information about our CDL training program?