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Practice test 6 of 10

Maine CDL — Air Brakes Practice Test 6

The Maine 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.The walk-around check sets a limit on how long a crack in a brake drum may be, measured against the width of the friction area. What does the manual say about brake discs?
  2. 2.Which of these parts is NOT in the chain that applies an s-cam brake when you press the pedal?
  3. 3.Several parts of the Step 7 final air brake check have you pump the brake pedal so that tank pressure comes down. Which of these checks does NOT work that way?
  4. 4.How does the manual's final air brake check have you confirm that the parking brake will hold?
  5. 5.One part of the final air brake check confirms that the spring brakes apply on their own. As you keep fanning off air on a tractor-trailer, which controls should pop out when pressure falls to the manufacturer's specification?
  6. 6.Which of these is NOT one of the conditions the manual attaches to its 55-mph total stopping distance figure for an air-braked vehicle?
  7. 7.Three of these statements about the safety relief valve agree with the manual. Which one does NOT?
  8. 8.Maine's inspection test section explains why the air lines running from the power unit to the trailer matter. What does it say losing the air supply to the trailer will lead to?
  9. 9.Three of these statements about the dual parking control valves found on some buses match the manual. Which one does NOT?
  10. 10.A Maine driver whose CDL carries the air brake restriction is asked to cover a shift in a dump truck that has air brakes. What does the Maine manual say about that?

0 of 25 answered