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Kentucky CDL — Air Brakes Practice Test 1

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.On a tractor or straight truck, spring brakes come fully on when air pressure drops into what range?
  2. 2.Which statement about ABS and your normal brakes is correct?
  3. 3.When checking governor cut-in and cut-out during the final air brake check, at about what pressures should the compressor start and stop?
  4. 4.During a walk-around, a manually adjusted s-cam slack adjuster probably needs adjustment if it moves more than about how much?
  5. 5.With the engine off and the parking brake released, a single vehicle's air pressure loss should stay under how much in one minute?
  6. 6.What information does a supply pressure gauge give the driver?
  7. 7.On newer air brake vehicles, what does the parking brake control knob look like?
  8. 8.In a dual air system at operating rpm, pressure should climb from 85 to 100 psi within how long?
  9. 9.After a loss of air, why does a heavily loaded vehicle need a long distance to stop once the spring brakes apply?
  10. 10.In a vehicle with a dual air brake system, how much pressure should the compressor build in both systems before you drive?

0 of 25 answered