CDL AIR BRAKES PRACTICE TEST – 01

We know that taking the air brakes test as part of your CDL permit can cause anxiety in even the most confident driver. That is why we designed this free CDL air brakes practice test so that you can practice and get an idea of what types of questions will be asked on the actual test at the DMV. 

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Air Brake Test 01

1 / 30

When air is pumped into a brake chamber, what is the first thing that happens?

2 / 30

On large buses, it is common for low-pressure warning devices to activate at around...?

3 / 30

Air compressor governors are programmed to cut out when air pressure reaches around...?

4 / 30

Spring brakes are usually fully activated when the air pressure is between...?

5 / 30

Air tanks should be drained to clear them of...?

6 / 30

In a wedge brake system, a push rod pushes a wedge directly...?

7 / 30

Supply pressure gauges on an air brake system tell you...?

8 / 30

The stoplights on an air brake system are activated by...?

9 / 30

Foundation brakes can be found on...?

10 / 30

The resistance you feel when you push the brake pedal down comes from...?

11 / 30

If application pressure increases without a decrease in speed, you need to...?

12 / 30

An air compressor governor will resume pumping air to the tanks when tank pressure falls below around...?

13 / 30

Emergency brakes and parking brakes on all large vehicles must be operated by...?

14 / 30

Air brake systems are three braking systems combined. They are:

15 / 30

Which of these brake systems uses a 'power screw'?

16 / 30

The most common sort of emergency and parking brake on large vehicles is...?

17 / 30

The low air pressure warning signal on an air brake system must come on before the air pressure falls below...?

18 / 30

Brakes can stop working if...?

19 / 30

An air pressure system is fully charged at _____ P.S.I.?

20 / 30

If the spring brakes are on you should push the brake pedal.

21 / 30

Pumping the brake pedal up and down unnecessarily can result in...?

22 / 30

Safety relief valves on the first tanks are usually set to open at...?

23 / 30

Many vehicles have automatic front wheel limiting valves, which will reduce air to the front brakes unless they are applied with a pressure of greater than...?

24 / 30

You should drain air tanks at the end of...?

25 / 30

Drum brakes work by pressing brake shoes and linings against...?

26 / 30

The application pressure gauge shows...?

27 / 30

The air compressor should stop pumping at about ____ P.S.I.

28 / 30

On vehicles made before 1975, if the front brake limiting valve control is switched to 'slippery' the air pressure to the front brakes will be cut by...?

29 / 30

When the low air pressure warning light or buzzer comes on, you should...?

30 / 30

The brake system that applies the use of the brakes when the driver uses the brake pedal is the ______ brake system?

Your score is

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Taking the air brake test as part of your CDL permit can be a source of anxiety, even for experienced drivers. To help you prepare, we have created a free air brake CDL practice test that reflects the types of questions you may encounter on the actual DMV test. We encourage you to use this resource multiple times until you feel confident in achieving a perfect score.

This practice test is designed to enhance your understanding of the material and improve your skills as you study for your exam. We invite you to explore all of our practice exams to support your preparation further.

By engaging with these tailored CDL air brake test questions, you will not only build your confidence but also gain essential knowledge for a successful career in driving.