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Practice test 4 of 10

Kentucky CDL — Air Brakes Practice Test 4

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 is the most common brake problem found during roadside inspections?
  2. 2.What should you do as soon as the low-air warning light and buzzer come on?
  3. 3.What is the purpose of the stop light switch in an air brake system?
  4. 4.Using the proper downhill braking technique, how long should each brake application last?
  5. 5.Which type of foundation brake is the most common on air brake vehicles?
  6. 6.Why should you avoid pressing the brake pedal while the spring brakes are already applied?
  7. 7.Why can needlessly pumping the brake pedal be dangerous on an air brake vehicle?
  8. 8.With the engine off and the parking brake released, a single vehicle's air pressure loss should stay under how much in one minute?
  9. 9.What does an alcohol evaporator do for an air brake system?
  10. 10.In a dual air system, what happens to your stopping ability if one system loses most of its pressure?

0 of 25 answered