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
Full answers + detailed explanations
Perfect for first-time, renewal applicants
ME CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
How far should manual slack adjusters move before they need to be adjusted?
On a long or steep downgrade, the foot brakes should be used:
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
The ____ shows how much pressure is in the air tanks.
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
What should a driver do when the low air pressure warning signal comes on?
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
If the air compressor should develop a leak, what keeps the air in the tanks?
Spring brakes will come on automatically, but the parking brake can also be applied:
What happens when your brake drums get very hot?
After the initial pressure drop, air leakage for single vehicles should be less than:
The S-cam:
Under normal braking conditions, the vehicle:
All of the following apply if the low air pressure warning signal does not work except:
At what level will the low air warning usually take effect?
The service brake system ________.
Brake drums should not have cracks longer than what length?
If air supply drops when driving, the tractor protection valve ________.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
Why should air tanks be drained completely?
What is a wig wag ?