CDL Air Brakes Test 1 – Classic Mode

This is CDL Air Brakes Test 1 in our original Classic Mode. Simply click in your answer to each CDL practice test question. When you're finished, check your score and results. You can reset the test and retake it as needed.

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1. Brake drums...

A Are bolted to the wheels
B Are located at each end of the vehicle's axles
C Hold the brake shoes and linings
D All of the above

2. When the low pressure warning is activated, you should...

A Wait for the air brakes to come on automatically
B Bring the vehicle to a safe stop while you still control the brakes
C Monitor your air pressure gauge and maintain highway speeds
D Pump the brake pedal hard to stop

3. When the safety valve releases air it means that...

A The pressure has exceeded 150 psi
B Too much air is in the air compressor
C Something is wrong, and you should have it checked by a mechanic
D All of the above

4. In a single vehicle with a fully charged air system, air pressure loss (after the initial drop and brake applied) should be less than...

A 2 psi per minute
B 3 psi per minute
C 4 psi per minute
D none of the above

5. The service brake system...

A is an official vehicle inspection
B applies and releases the brakes by using the brake pedal under normal driving
C are the valves that keeps the air tank pressure serviced
D is only on vehicles with hydraulic brakes

6. Your vehicle's single brake system needs adjustment if...

A pressure builds from 50 to 75 psi within three minutes
B pressure builds from 85 to 100 psi within 45 seconds
C the compressor cuts out between 70 to 90 psi
D the governor stops between 75 to 90 psi

7. Some air brake systems have an alcohol evaporator which helps...

A Reduce the risk of ice in the air brake valves during cold weather
B Remove oil from the air lines
C Reduce the risk of water in the air brake valves in warm weather
D Remove fuel from the air lines

8. Air tanks should be drained...

A Once a week
B Once a day
C Every four hours
D Every two or three days

9. The safety valve in the air compressor tank is set to open at...

A 150 psi
B 200 psi
C 100 psi
D 175 psi

10. Compressed air is stored...

A In the hoses
B In the engine compartment
C In the fuel tank
D In the storage tank

End of Test #1

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