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Practice test 2 of 10

Oklahoma CDL — Air Brakes Practice Test 2

The Oklahoma 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.At about what tank pressure does the governor reach its cut-out point and stop the compressor from pumping?
  2. 2.During stab braking, how long can it take for the wheels to start rolling again after you release the brakes?
  3. 3.When checking a slack adjuster on an s-cam brake, about how far can it move before it likely needs adjusting?
  4. 4.While a vehicle is being driven, what holds the powerful springs of the spring brakes back?
  5. 5.A visible low air pressure warning must switch on before tank pressure falls below what level?
  6. 6.Compared with the instant action of hydraulic brakes, how long does air take to reach the brakes after the pedal is pushed?
  7. 7.What color are the ABS malfunction lamps that warn of a fault?
  8. 8.Which statement about slack adjusters on vehicles built since 1994 is accurate?
  9. 9.On air-operated disc brakes, what component does the job that an s-cam does on drum brakes?
  10. 10.Why is working the brake pedal up and down when you do not need to slow down a bad habit?

0 of 25 answered