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Practice test 5 of 10

Washington CDL — Air Brakes Practice Test 5

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.Using the recommended braking technique on a long downgrade, once you are in the proper low gear you should do what?
  2. 2.The visible low-air-pressure warning must come on before tank pressure drops below what level?
  3. 3.In the applied-pressure leak test with the foot brake held down, a single vehicle should not lose more than how much in one minute?
  4. 4.What does an alcohol evaporator do for an air brake system?
  5. 5.If you must keep raising the application pressure just to hold the same speed, what is likely happening?
  6. 6.Even with an alcohol evaporator fitted, what cold-weather chore still has to be done daily unless the drains are automatic?
  7. 7.Air pressure has dropped far enough for the spring brakes to set on an empty rig or on a slippery road. What is the particular danger?
  8. 8.On a tractor or straight truck, the spring brakes come fully on when air pressure falls into roughly what range?
  9. 9.What feature is sometimes added to automatic tank drains for cold climates?
  10. 10.When using stab braking, when should you reapply the brakes after releasing them?

0 of 25 answered