Maine CDL — Air Brakes Practice Test
The Maine CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.
Or take one of 10 full-length practice tests
25 questions · pass with 20 correct. You get instant feedback and an explanation after every answer.
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The full-length test, with feedback and an explanation after every answer.
Maine CDL — Air Brakes practice tests
10 full-length practice tests, each with 25 questions and a pass mark of 20, like the real test. You see the answers and explanations after you grade.
- Test 1
25 questions · pass with 20
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?
- Test 2
25 questions · pass with 20
Some air compressors carry their own oil supply. How does the manual say a compressor without one is lubricated?
- Test 3
25 questions · pass with 20
A Maine permit holder arrives for a skills test in an air-braked truck to clear the air brake restriction. The driver who came along does not hold the proper license and endorsements. What does the Maine manual say happens?
- Test 4
25 questions · pass with 20
Which order matches the manual's steps for a normal stop in an air-braked truck with a manual transmission?
- Test 5
25 questions · pass with 20
With the engine off, you fully apply the foot brake on a tractor-trailer and hold it for one minute. The air gauge falls 3.5 psi in that minute. How does that compare with the manual's standard?
- Test 6
25 questions · pass with 20
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?
- Test 7
25 questions · pass with 20
Most heavy-duty vehicles have a dual air brake system instead of a single one. What reason does the manual give?
- Test 8
25 questions · pass with 20
A major leak has pulled your straight truck's air pressure down to 40 psi, and it is still falling. What should you expect from the spring brakes at this point?
- Test 9
25 questions · pass with 20
You are in the proper low gear on a long downgrade with a 'safe' speed of 50 mph. You braked down to 45 mph and released, and the speedometer now shows 48 mph and rising. What does the manual's technique call for?
- Test 10
25 questions · pass with 20
A commercial learner's permit applicant never takes the air brake portion of the knowledge exam. According to the manual's restriction list, can the L restriction be placed on the permit itself?