South Carolina DMV CDL Air Brakes Quick Practice Test

South 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. If using spring brakes when hauling a heavy load, a complete stop will:

Be impossible.
Take a long time.
Take a short amount of time.

2. Most heavy-duty vehicles use:

Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.

3. Brakes can get out of adjustment quickly, especially:

If they are hot.
In the winter time.
If they are used frequently.

4. Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:

Are necessary for the proper function of the air brake system.
Should be added if low.
Should be removed regularly.
Are not concerns.

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

The service brake system
The parking brake system
The emergency brake system
The auxiliary brake system

6. Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

7. The safety valve located on the first tank opens:

Regularly.
If there is too little pressure.
If there is too much pressure.
After every stop.

8. Air tank drains:

Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.

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