# Free Maine CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Maine CDL Air Brake test has some differences from other endorsements because your license will receive a mark of restriction if you fail the test. So having good preparation before exam day is very necessary. To ensure that our questions are relevant, all of our CDL practice test packs are based on the Maine CDL Manual. Each question has a detailed explanation for you to thoroughly learn the format and the topic. Don't be afraid of having a restriction on your license. Let’s try our Maine CDL Practice Test to get ready to pass the Maine CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 ME commercial driver's license manual
Perfect for first-time, renewal applicants
ME CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
2.
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
3.
Excessive use of the service brakes results in overheating which can lead to:
4.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
5.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
6.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
7.
The application pressure gauge shows how much air pressure you:
8.
While applying the brakes, what tells the driver how much air pressure is being used?
9.
When the safety valve releases air this indicates ___________.
10.
When your brake's main air pressure is lost ________.
11.
When does the air compressor governor allow air to start pumping?
12.
If the low air warning comes on while you are driving, you should:
13.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
14.
The air compressor governor controls:
15.
What tells the driver how much air pressure is in the air tanks?
16.
Pressing and releasing the brake pedal unnecessarily:
17.
Controlled braking is only possible _________.
18.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
19.
Why should you drain water from compressed air tanks?
20.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
21.
What is used to put alcohol into the system and reduce ice risk?
22.
In a dual air brake system, one system will typically control the rear brakes, and the other:
23.
Manual air tank drains require:
24.
What does ABS stand for?
25.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?