North Carolina DMV CDL Air Brakes Quick Practice Test For 2026

CDL Class A, B or C. Complete CDL driver training course. All the questions in this test are from the official DMV written exam. You can use our free online tests to evaluate how likely you are to pass the official DMV test. Or you can just cut to the chase and increase your chances of passing by upgrading to Premium Membership and unlock official DMV tests. In addition, you will also receive a master cheat sheet which contains all your state’s DMV questions and answers. Premium membership also unlocks a smart tracker which keeps an inventory of all incorrectly answered questions for easy, fast and effective revision. Practice with our free tests or hit Upgrade button below for premium access and increase your chances of passing your DMV written exam.

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Quick Facts:

Number of Questions – 20

Passing Percentage – 80%

Test Type – Free Test

1. Air brakes use ____ to function.

2. When operating a vehicle with a dual brake system, a driver should:

3. A wig wag is:

4. The two markings on a front brake limiting valve usually read:

5. The parking brake should be:

6. The brake pedal is part of which braking system?

7. What is often found in compressed air?

8. Failing to drain air tanks could result in:





 
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