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Practice test 6 of 10

Oregon CDL — Air Brakes Practice Test 6

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.What job does an alcohol evaporator do on the air brake systems that have one?
  2. 2.If one half of a dual air brake system loses most of its pressure, you should expect that:
  3. 3.For an average driver at 55 mph in good conditions, the total stopping distance with air brakes is about:
  4. 4.What physically causes brake fade when the brakes overheat?
  5. 5.Why is there a short delay before air brakes grip after the pedal goes down?
  6. 6.On a newer tractor, the yellow ABS lamp finishes its start-up bulb check but then comes back on as you drive off. This most likely means:
  7. 7.When using the stab braking method, you release the brakes:
  8. 8.Since which year have all vehicles been built with automatic slack adjusters?
  9. 9.In a vehicle without ABS, locking the front (steering) wheels during a hard stop will:
  10. 10.Truck tractors with air brakes must be equipped with antilock brakes if built on or after:

0 of 25 answered