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Practice test 3 of 10

Kentucky CDL — Air Brakes Practice Test 3

The Kentucky 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 produces the friction that slows an s-cam drum brake, and what side effect does it create?
  2. 2.During a walk-around, a manually adjusted s-cam slack adjuster probably needs adjustment if it moves more than about how much?
  3. 3.How do you test the parking brake during the air brake inspection?
  4. 4.In a dual air system, what happens to your stopping ability if one system loses most of its pressure?
  5. 5.On newer air brake vehicles, what does the parking brake control knob look like?
  6. 6.A brake drum may be unsafe if it has a crack of what size?
  7. 7.How does a "wig wag" low-pressure warning device work?
  8. 8.In "controlled braking" during an emergency, how hard do you apply the brakes?
  9. 9.At 55 mph on dry pavement, about how many feet does air brake lag add to the stopping distance?
  10. 10.What should you never do when leaving your vehicle unattended?

0 of 25 answered