Maryland DMV CDL Air Brakes Quick Practice Test

Maryland DMV CDL Air Brakes Quick Practice Test For 2025

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. A dual air brake system:

Has a single air brake system, but uses two sets of controls.
Has one air brake system for each side of the truck.
Has two brakes for each wheel.
Has two separate air brake systems, but uses a single set of controls.

2. The air compressor is connected to the:

Transmission.
Engine.
Radiator.

3. All air tanks must include:

A drain valve.
A lock.
A trap door.
A warning sticker.

4. When only the tractor is equipped with an Anti-Lock Braking System (ABS):

There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.

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

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

6. 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

7. A wig wag is:

A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.

8. If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. The belt should be:

Loosely attached.
Tight.
Cracked.
Frayed.

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