Skip to main content
DMV Test Free
ENES

Practice test 10 of 10

New Jersey CDL — Air Brakes Practice Test 10

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.In a dual air brake system, what happens to your stopping if one of the two systems loses most of its pressure?
  3. 3.On a tractor or straight truck, in what pressure range do the spring brakes typically come fully on by themselves?
  4. 4.Where does the emergency brake system get the parts it uses to stop a vehicle after a failure?
  5. 5.When should you avoid setting the parking brakes and use wheel chocks instead?
  6. 6.What is the main job of the air compressor on an air brake vehicle?
  7. 7.At roughly what tank pressure does the governor normally stop the compressor from pumping (the cut-out point)?
  8. 8.At about what pressure does the governor let the compressor begin pumping again (the cut-in point)?
  9. 9.What does the air compressor governor control?
  10. 10.When checking brake drums, how large a crack makes a drum unsafe?

0 of 25 answered