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Practice test 7 of 10

Washington CDL — Air Brakes Practice Test 7

The Washington 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.Before driving a dual-air vehicle, you should let pressure build to at least what level in BOTH systems?
  2. 2.In an air-operated disc brake, what part takes the place of the s-cam?
  3. 3.The manual gives one exception to braking normally in an emergency. Which vehicle does it apply to?
  4. 4.On a newer air brake vehicle, how is the parking brake control usually identified?
  5. 5.What feature is sometimes added to automatic tank drains for cold climates?
  6. 6.What is the purpose of a modulating control valve for the spring brakes?
  7. 7.If the air compressor carries its own oil supply, what should the driver do before setting out?
  8. 8.During a walk-around, a manual s-cam slack adjuster likely needs adjustment if it moves more than about how far where the push rod attaches?
  9. 9.If the safety valve starts letting air escape, what should you conclude?
  10. 10.You are braking hard in a combination where only the tractor is fitted with ABS, and the trailer starts to swing out. What should you do?

0 of 25 answered