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Alaska CDL — Air Brakes Practice Test 1

The Alaska 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.Some automatic air tank drains can be had with electric heating devices. What are the heaters for?
  2. 2.You hook up to an older trailer built before ABS was required, and you can't tell whether it has ABS. What does the manual suggest?
  3. 3.Besides brake fade, the manual lists other things that can make you need more application pressure than usual. Which of these is NOT on its list?
  4. 4.Why does the manual call it dangerous to manually adjust an automatic slack adjuster?
  5. 5.On a long grade, overheated brake drums expand. What does the manual say this does to the brake shoes and linings?
  6. 6.Checking slack adjusters on s-cam brakes means releasing the parking brakes so the adjusters can move. What does the manual have you do first so the vehicle stays put?
  7. 7.Leaving emergencies aside, when does the manual say an automatic slack adjuster should need to be adjusted by hand?
  8. 8.In an air-operated disc brake, which part does the job that the s-cam does in a drum brake?
  9. 9.On a long hill, your application pressure gauge shows you need more and more pressure just to hold the same speed. What does the manual tell you to do?
  10. 10.Your vehicle has air over hydraulic brakes, not a full air brake system. Under the manual's list of knowledge tests, do you take the air brakes test?

0 of 25 answered