CDL Air Brakes Test

3

This is the Commercial Vehicle Driver's License Test covering Air Brakes.  You will be presented with 40 questions and you must answer 34 questions correctly to pass.  There is no time limit.  You may not go back once you answer a question.  Click the "Start Quiz" button below to begin.  Good luck!

1 / 40

You should___when driving down a long steep hill.

2 / 40

Why are you required to take an exam about air brakes?

3 / 40

An example of a low pressure warning signal for air brakes is:

4 / 40

You should____to check the free play of manual slack adjusters on S-Cam brakes.

5 / 40

Should the air pressure in the service air tanks fall below____the driver must be alerted via warning mechanism in the truck cab.

6 / 40

How often should air tanks be drained?

7 / 40

The best way to test the low air pressure warning signal is to:

8 / 40

At around____the governor allows the air compressor to start pumping again:

9 / 40

Select the true statement in regards to brake drums or discs:

10 / 40

An air system that is fully charged will typically have ___ psi of pressure.

11 / 40

You should_____when checking the slack adjusters on S-Cam brakes.

12 / 40

When does stab braking occur?

13 / 40

What is the brake system that applies and releases the brakes when the brake pedal is used?

14 / 40

Select the reason as to why air tanks need to be drained:

15 / 40

You should___to reduce the air leakage rate.

16 / 40

What are spring brakes?

17 / 40

What are slack adjusters?

18 / 40

A slack adjuster is:

19 / 40

Select the statement that tells you how you can check the low pressure warning signal.

20 / 40

What is a supply pressure gauge used for?

21 / 40

Select the true statement about emergency brakes:

22 / 40

You should_____to make an emergency stop with air brakes when using the stab braking method.

23 / 40

You should be in the proper gear before going down a hill because:

24 / 40

What must vehicles with air brakes have?

25 / 40

Select how brakes work on long, steep downgrades:

26 / 40

The best way to describe a dual air brake system is:

27 / 40

Select the statement that is not part of the air-brake system:

28 / 40

Select the factor that is known to cause brakes to fail or fade. (more than one answer may be correct, but select only one)

29 / 40

The safety valve is usually set to open at:

30 / 40

Select the answer that is not a part of the braking process when driving a tractor-trailer combination vehicle that has ABS:

31 / 40

What does it man when the safety valve releases air?

32 / 40

What is the benefit of ABS?

33 / 40

Select the true statement in regards to an application pressure gauge:

34 / 40

Select the true statement in regards to your brake function when your ABS fails

35 / 40

The 3 parts of the air brake system are: service brakes, parking brakes, and ____.

36 / 40

Select the true statement about slack adjusters:

37 / 40

Select how you would check the truck's slack adjusters.

38 / 40

The method used to make sure the spring brakes will come on automatically is to:

39 / 40

Select the inappropriate way to test for the low pressure warning signal.

40 / 40

How can you check slack adjusters?

Your score is

The average score is 72%

5/5 - (1 vote)

CDL Category Practice Tests