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Practice test 6 of 10

Kentucky CDL — Air Brakes Practice Test 6

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.When checking governor cut-in and cut-out during the final air brake check, at about what pressures should the compressor start and stop?
  2. 2.In "controlled braking" during an emergency, how hard do you apply the brakes?
  3. 3.On a long, steep downgrade, the service brakes should be used in what role?
  4. 4.A brake drum may be unsafe if it has a crack of what size?
  5. 5.How do you test the parking brake during the air brake inspection?
  6. 6.What mainly causes brakes to fade or fail from overuse?
  7. 7.In a dual air system at operating rpm, pressure should climb from 85 to 100 psi within how long?
  8. 8.When should you avoid setting the parking brakes?
  9. 9.At what pressure is the air brake safety relief valve usually set to open?
  10. 10.On a tractor or straight truck, spring brakes come fully on when air pressure drops into what range?

0 of 25 answered