Oregon CDL — Air Brakes Practice Test

The Oregon 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.

Oregon 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
If the low-air pressure warning activates while you are driving, you should:
Test 2
25 questions · pass with 20
In controlled braking during an emergency, how hard do you press the brakes?
Test 3
25 questions · pass with 20
To set the parking brakes on a newer air-brake vehicle, you:
Test 4
25 questions · pass with 20
During a normal stop with a manual transmission, you should press the clutch only when:
Test 5
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 6
25 questions · pass with 20
What job does an alcohol evaporator do on the air brake systems that have one?
Test 7
25 questions · pass with 20
Before walking away from a truck you will leave unattended, the handbook requires you to:
Test 8
25 questions · pass with 20
In a vehicle without ABS, locking the front (steering) wheels during a hard stop will:
Test 9
25 questions · pass with 20
If one half of a dual air brake system loses most of its pressure, you should expect that:
Test 10
25 questions · pass with 20
Which foundation brake design is found most often at each wheel of an air-brake vehicle?