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Practice test 10 of 10

Colorado CDL — Air Brakes Practice Test 10

The Colorado CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.

This practice test follows that format: 25 questions, pass with 20 correct. Answer every page, then grade it to see the answers and explanations.

Questions 1–10 of 25

  1. 1.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?
  2. 2.How do you test that the parking brake will hold?
  3. 3.On an older vehicle, putting the front brake limiting valve control in the "slippery" position does what?
  4. 4.When testing the low pressure warning signal, before what pressure must the warning turn on?
  5. 5.What best describes a dual air brake system?
  6. 6.What does the supply pressure gauge in the cab tell the driver?
  7. 7.In an s-cam drum brake, what actually slows the vehicle down?
  8. 8.Why can brakes that are out of adjustment leave you without enough braking power to control the vehicle?
  9. 9.What is the main function of an anti-lock braking system (ABS) on a commercial vehicle?
  10. 10.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?

0 of 25 answered