Michigan CDL — Air Brakes Practice Test

The Michigan CDL — Air Brakes knowledge test has 25 questions; you need 20 correct (80%) to pass.

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25 questions · pass with 20 correct. You get instant feedback and an explanation after every answer.

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Michigan 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
Why can a heavily loaded vehicle take a long distance to stop once the spring brakes apply on their own?
Test 2
25 questions · pass with 20
If one half of a dual air brake system loses most of its pressure, what happens?
Test 3
25 questions · pass with 20
Air brakes actually bundle three braking systems into one setup. Which grouping correctly names them?
Test 4
25 questions · pass with 20
How do you test that the parking brake will hold?
Test 5
25 questions · pass with 20
Suppose the low-pressure warning activates while you are driving. What is the safest thing to do?
Test 6
25 questions · pass with 20
On a truck that has a dual air brake system, how much pressure should the compressor build in both halves before you drive off?
Test 7
25 questions · pass with 20
Which sequence correctly describes stab braking?
Test 8
25 questions · pass with 20
On a trailer equipped with ABS, where is the yellow malfunction lamp located?
Test 9
25 questions · pass with 20
On newer air brake vehicles, what does the parking brake control usually look like?
Test 10
25 questions · pass with 20
What most directly causes brake fade on a long downgrade?