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Practice test 7 of 10

New Jersey CDL — Air Brakes Practice Test 7

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.What happens to the applied braking force as you push the brake (foot) pedal down harder?
  2. 2.What is the main job of the air compressor on an air brake vehicle?
  3. 3.During a walk-around inspection, how much movement in a slack adjuster suggests the brakes need adjustment?
  4. 4.As soon as the low-air warning light and buzzer come on, what should you do?
  5. 5.Which brake system operates when you press the pedal during ordinary driving?
  6. 6.If the air compressor has its own separate oil supply, what should you do before driving?
  7. 7.In a dual air brake system, what happens to your stopping if one of the two systems loses most of its pressure?
  8. 8.In a drum brake, what actually slows the vehicle and produces heat?
  9. 9.On a tractor or straight truck, in what pressure range do the spring brakes typically come fully on by themselves?
  10. 10.What should you conclude if the air system's safety valve lets air escape?

0 of 25 answered