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Practice test 6 of 10

Louisiana CDL — Air Brakes Practice Test 6

The Louisiana 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.Why is it important to drain the air tanks?
  2. 2.What does an antilock braking system (ABS) do during hard braking?
  3. 3.With the engine off, the parking brake released, and a fully charged system, the air pressure loss for a single vehicle should stay under what rate?
  4. 4.In a drum brake, what actually slows the vehicle?
  5. 5.In a dual air system, if one of the two systems gets very low on pressure, what happens?
  6. 6.How do you test that the parking brake will hold?
  7. 7.What must you do before pulling on the slack adjusters to check them?
  8. 8.On large buses, at about what pressure do the low-air warning devices commonly activate?
  9. 9.The governor lets the compressor resume pumping at roughly what pressure?
  10. 10.At about what pressure does the governor tell the compressor to stop pumping air?

0 of 25 answered