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Practice test 4 of 10

Maine CDL — Air Brakes Practice Test 4

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.Which order matches the manual's steps for a normal stop in an air-braked truck with a manual transmission?
  2. 2.Why does the manual tell drivers to consult the specific manufacturer's service manual before troubleshooting a brake adjustment problem on automatic slack adjusters?
  3. 3.Some wedge brakes use two brake chambers instead of one. Where do the wedges push in that design?
  4. 4.On Maine's inspection test, you check the air and electric line connections on a combination vehicle. What must you do to receive credit for that item?
  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.Four units in a fleet all have ABS. Which one carries its yellow ABS malfunction lamp somewhere other than the instrument panel?
  7. 7.Which of these parts is NOT in the chain that applies an s-cam brake when you press the pedal?
  8. 8.Three of these statements about the safety relief valve agree with the manual. Which one does NOT?
  9. 9.A new driver believes the governor sets how hard the brakes apply when the pedal is pressed. What does the governor actually do?
  10. 10.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?

0 of 25 answered