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Oregon CDL — Air Brakes Practice Test 1

The Oregon 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.If the low-air pressure warning activates while you are driving, you should:
  2. 2.What physically causes brake fade when the brakes overheat?
  3. 3.Compared with the near-instant action of hydraulic brakes, air brakes need roughly how long for pressure to reach the brakes?
  4. 4.Why is it a bad habit to keep pressing and letting off the brake pedal when braking is not actually needed?
  5. 5.In a vehicle without ABS, locking the front (steering) wheels during a hard stop will:
  6. 6.Besides the service brakes, all trucks, truck tractors, and buses must be fitted with:
  7. 7.A brake drum should be flagged during inspection when a crack is:
  8. 8.When should you NOT rely on the parking brakes to hold the vehicle?
  9. 9.In the static leakage test on a single vehicle with the engine off and brakes released, air loss should stay under:
  10. 10.Air-brake trucks, buses, trailers, and converter dollies must have ABS when built on or after:

0 of 25 answered