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Practice test 3 of 10

Oregon CDL — Air Brakes Practice Test 3

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.To set the parking brakes on a newer air-brake vehicle, you:
  2. 2.Brake linings should be replaced when they are:
  3. 3.A brake drum should be flagged during inspection when a crack is:
  4. 4.About how much distance does air brake lag add at 55 mph on dry pavement?
  5. 5.Every vehicle with air brakes is required to have which of these?
  6. 6.Where should you look for a trailer's ABS malfunction lamp?
  7. 7.What job does an alcohol evaporator do on the air brake systems that have one?
  8. 8.When you pull hard on a manual slack adjuster, roughly how much movement suggests it needs adjustment?
  9. 9.During a normal stop with a manual transmission, you should press the clutch only when:
  10. 10.Which statement best describes what antilock brakes contribute on an air brake vehicle?

0 of 25 answered