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Practice test 6 of 10

Connecticut CDL — Air Brakes Practice Test 6

The Connecticut 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 is a modulating control valve on the dash used for?
  2. 2.On newer air brake vehicles, how do you apply the parking (spring) brakes?
  3. 3.The governor lets the compressor begin pumping again once tank pressure falls to what level?
  4. 4.Some buses carry a second parking control fed by its own small air tank. Why does that help in an emergency?
  5. 5.How do you park a vehicle whose spring brakes are set by a modulating control lever?
  6. 6.In a dual air brake system, what happens if one of the two systems becomes very low on pressure?
  7. 7.How are spring brakes held in the released position while you drive?
  8. 8.How do you test that the parking brake will actually hold?
  9. 9.When checking a slack adjuster on an s-cam brake, how much movement suggests it needs adjustment?
  10. 10.When may you fully apply the brakes in an emergency stop?

0 of 25 answered