Montana DMV CDL Air Brakes Quick Practice Test

Montana 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. What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.
The brakes may not work.
The brakes may be sluggish.
The brakes will be very sensitive.

2. Which of the following is not a part of an air brake system?

A service brake system
A parking brake system
An emergency brake system
An axle brake system

3. You should not use the parking brake:

If your vehicle is stopped on a level surface.
If your vehicle is stopped on a slight incline.
If your vehicle's brakes are very hot.
If your vehicle's other braking systems seem to be working adequately.

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

"Normal" and "slippery."
"Low" and "high."
"Left" and "right."

5. What does an air compressor do in an air brake system?

It pumps air into the air storage tanks.
It fills the tires.
It moves air to the back of the truck.

6. What is removed when an air tank is drained?

Water and oil
Ammonia
Liquid cleaners

7. 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.

8. What is often found in compressed air?

Water
Cardboard
Brake fluid

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