Maine DMV CDL Air Brakes Quick Practice Test

Maine 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. Which type of vehicle is most prone to the “crack-the-whip” effect?

A five-axle tractor semi-trailer
A three-axle tractor semi-trailer
A bobtail tractor
A triple trailer

2. What helps prevent wheel lockup when braking?

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

3. Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.

25 psi
50 psi
75 psi
100 psi

4. On trucks and buses, where are ABS malfunction lamps located?

On the driver’s door
On the instrument panel
On the outside of the vehicle by the passenger’s door
Under the hood

5. Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.

6. An alcohol evaporator is especially important:

In cold weather.
In hot weather.
In dry weather.

7. Alcohol evaporators are:

Illegal.
Used to introduce alcohol into air brake systems.
Only allowed in the northern parts of the state.

8. To prevent a rollover, cargo should be:

Placed near the front of a trailer.
Placed near the rear of a trailer.
Spread out on a trailer.
Loaded with most weight on the driver’s side of a trailer.

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