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Practice test 8 of 10

New Jersey CDL — Air Brakes Practice Test 8

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.In a drum brake, what actually slows the vehicle and produces heat?
  2. 2.How does ABS affect your normal stopping distance?
  3. 3.When should you avoid setting the parking brakes and use wheel chocks instead?
  4. 4.On a trailer, where would you look for the yellow ABS malfunction lamp?
  5. 5.When checking brake drums, how large a crack makes a drum unsafe?
  6. 6.On a tractor or straight truck, in what pressure range do the spring brakes typically come fully on by themselves?
  7. 7.At what pressure is the air system's safety relief valve usually set to open?
  8. 8.What is the purpose of an alcohol evaporator in some air brake systems?
  9. 9.How are spring brakes held in the released position while you drive?
  10. 10.What is the key idea behind the "controlled braking" method?

0 of 25 answered