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Practice test 8 of 10

Virginia CDL — Air Brakes Practice Test 8

The Virginia 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.At roughly what tank pressure does the governor 'cut out' and stop the compressor from pumping more air?
  2. 2.On a tractor or straight truck, the spring brakes typically come fully on when air pressure falls to what range?
  3. 3.Where is the ABS malfunction lamp located on a trailer?
  4. 4.How does the stop light switch on an air-brake vehicle operate?
  5. 5.When should you NOT set the parking brakes?
  6. 6.If the air compressor has its own separate oil supply, what should you do before driving?
  7. 7.Using the recommended downgrade technique with a 'safe' speed of 40 mph, at what point do you apply the brakes and to what speed do you slow before releasing?
  8. 8.In a dual air brake system, what are the two systems called?
  9. 9.How do you test that the parking brake will actually hold?
  10. 10.What is a 'wig wag' low-pressure warning device?

0 of 25 answered