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Practice test 5 of 10

New Jersey CDL — Air Brakes Practice Test 5

The New Jersey 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.You must keep increasing brake application pressure to hold the same speed. What is likely happening, and what should you do?
  2. 2.How is the air compressor typically driven by the engine?
  3. 3.In a drum brake, what actually slows the vehicle and produces heat?
  4. 4.When checking brake drums, how large a crack makes a drum unsafe?
  5. 5.On a trailer, where would you look for the yellow ABS malfunction lamp?
  6. 6.How does ABS affect your normal stopping distance?
  7. 7.On a vehicle with dual parking control valves, why must you plan carefully when using the separate tank to release the spring brakes?
  8. 8.At roughly what tank pressure does the governor normally stop the compressor from pumping (the cut-out point)?
  9. 9.How are spring brakes held in the released position while you drive?
  10. 10.The stopping power of spring brakes depends most on what condition?

0 of 25 answered