This free CDL practice test will focus on 30 questions related to the Air Brake portion of the Kentucky CDL exam. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. Be sure to also take the Kentucky General Knowledge and Kentucky Combination Vehicle practice tests.
1.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to
2.
Why should you not fan the brakes on and off during long downgrades?
3.
To use the stab braking technique during emergency braking, you
4.
A combination vehicle air brake system cannot leak more than ______ psi per minute with the engine off and the brakes released.
6.
Which of the following statements about brakes is true?
7.
The most common type of foundation brake found on heavy commercial vehicles is
8.
Which of the following is O.K. to find in the air brake system?
9.
When using the parking brakes or emergency brakes, what type of pressure is being used?
10.
Three different systems are found on modern air brake systems; service brakes, parking brakes, and the
11.
If your vehicle has an alcohol evaporator, it is there to
12.
If your vehicle is equipped with an alcohol evaporator, every day during the winter weather you should
13.
How do you check the free play in manual slack adjusters?
14.
What turns on the electrical stop light switch in an air brake system?
15.
If the air system should develop a leak, what will keep the air in the air tanks?
16.
The air loss rate for a straight truck or bus with the engine off and the brakes applied should not be more than
17.
The air compressor governor controls
18.
The vehicle must have a warning device which comes on when the air pressure in the service air tanks falls below
19.
The air supply pressure gauge shows the driver how much pressure
20.
In air brake equipped vehicles, you use the parking brakes when?
21.
You must make a quick emergency stop. You should brake so you
22.
Which brake system applies and releases the brakes when the driver uses the brake pedal?
23.
When a failure occurs in the service brake system, the system you need to stop the vehicle is the
24.
During normal operations, the parking and emergency brakes are usually held back by
25.
Air loss in a single vehicle (not a combination unit) should not be more than ______ with the engine off and the brakes on.
26.
The purpose of engine retarders is to
27.
A straight truck or bus air brake system cannot leak more than ______ psi per minute with the engine off and the brakes released.
28.
Air brake equipped vehicles must have
29.
What will determine how effective the spring emergency brakes or the parking brakes work?
30.
Which of the following answers is most correct about using brakes on a long and/or steep downgrade?
