CDL Air Brakes Test

4

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

At what "cut out" level does the governor stop pumping air?

2 / 40

Select the true statement about slack adjusters:

3 / 40

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

4 / 40

The compressor is connected to the engine via _____?

5 / 40

Is it mandatory that all vehicles with air brakes have low air pressure warning signals?

6 / 40

What is a supply pressure gauge used for?

7 / 40

How do you know when your brakes are fading?

8 / 40

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

9 / 40

A leak rate for a straight truck or bus air brake system should not exceed _____psi per minute when the engine is off and the brakes are released.

10 / 40

You should___when driving down a long steep hill.

11 / 40

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

12 / 40

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

13 / 40

Air pressure should build___with a dual air system.

14 / 40

Commerical vehicles typically have this type of brake.

15 / 40

With the engine cutt off and the brakes released the air loss in a straight truck or bus should not be more than:

16 / 40

Air tanks should be drained:

17 / 40

What does the service brake system do?

18 / 40

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

19 / 40

How can you check slack adjusters?

20 / 40

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

21 / 40

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

22 / 40

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

23 / 40

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

24 / 40

Air tanks need to be drained:

25 / 40

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

26 / 40

Where is compressed air stored?

27 / 40

The parking brakes should be used____in air brake vehicles.

28 / 40

Select when you should use the parking brake:

29 / 40

Alcohol evaporators in some air brake systems help to:

30 / 40

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

31 / 40

How often should you drain your air tanks?

32 / 40

How do you test your service brakes?

33 / 40

How do you determine if slack adjusters need to be adjusted?

34 / 40

What must vehicles with air brakes have?

35 / 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)

36 / 40

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

37 / 40

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

38 / 40

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

39 / 40

Why do air brakes take longer to stop than hydraulic brakes?

40 / 40

The best way to test if the spring brakes come on automatically is to:

Your score is

The average score is 82%

5/5 - (1 vote)

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