Colorado CDL — Air Brakes Practice Test
The Colorado CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.
Or take one of 10 full-length practice tests
25 questions · pass with 20 correct. You get instant feedback and an explanation after every answer.
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The full-length test, with feedback and an explanation after every answer.
Colorado CDL — Air Brakes practice tests
10 full-length practice tests, each with 25 questions and a pass mark of 20, like the real test. You see the answers and explanations after you grade.
- Test 1
25 questions · pass with 20
The governor stops the compressor from adding more air at about what pressure?
- Test 2
25 questions · pass with 20
What should you always do before leaving your vehicle unattended?
- Test 3
25 questions · pass with 20
At roughly what tank pressure does the governor allow the compressor to start pumping again?
- Test 4
25 questions · pass with 20
Why should you avoid pressing the brake pedal while the spring brakes are already applied?
- Test 5
25 questions · pass with 20
Which statement about ABS and stopping distance is accurate?
- Test 6
25 questions · pass with 20
Air pressure has fallen far enough that the spring brakes apply on their own. What hazard does that create for a lightly loaded truck or one on a slick road?
- Test 7
25 questions · pass with 20
What causes brakes to fade from excessive heat?
- Test 8
25 questions · pass with 20
Total stopping distance for an air-braked vehicle is made up of how many factors?
- Test 9
25 questions · pass with 20
On a vehicle with dual parking control valves and a separate air tank, what limits how you use it to move after the main air is lost?
- Test 10
25 questions · pass with 20
Air pressure has fallen far enough that the spring brakes apply on their own. What hazard does that create for a lightly loaded truck or one on a slick road?