North Carolina DMV CDL Air Brakes Quick Practice Test

North Carolina DMV CDL Air Brakes Quick Practice Test For 2024

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. Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.

2. The parking brake should be:

Used whenever you park your vehicle.
Used while driving.
Set when driving in bad weather.
Removed.

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

Let the vehicle warm up before driving to ensure that fuel reaches the engine.
Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.
Begin driving just after the vehicle starts.
Pump the pedal about 20 times to build pressure, then begin driving.

4. What helps prevent wheel lockup when braking?

An Anti-Lock Braking System (ABS)
Air brakes
An alternator

5. The service brake system:

Applies and releases the brakes when you press the brake pedal while driving normally.
Applies and releases the parking brakes.
Applies and releases the emergency brake.
Applies and releases the axle brake.

6. How many air storage tanks are used in an air brake system?

Two tanks
Four tanks
Six tanks
The number varies.

7. Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.

10 psi
25 psi
50 psi
100 psi

8. Brakes can get out of adjustment:

If they are hot.
During the winter.
If they are used at all.
If brakes on one side are used more often than brakes on the other side.

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