# 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.
The stop light switch:
2.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
3.
A low pressure warning signal could be __________.
4.
All air brake equipped vehicles have:
5.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
6.
Under normal conditions, in order to engage the parking brakes the driver should:
7.
8.
What negatively affects the braking power of a spring brake?
9.
When the air system is low ________.
10.
Where is the modulating control valve located on some vehicles?
11.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
12.
Another name for the brake pedal is the "foot valve", or:
13.
The safety valve reduces pressure at ___ psi.
14.
All of the following are factors in total stopping distance except:
15.
If your truck has a dual air brake system, and one of the systems is low on pressure:
16.
In case of emergency stops, drivers should:
17.
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
18.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
19.
Why does a heavily loaded vehicle need a longer distance to stop?
20.
How should the air leakage rate be tested?
21.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
22.
During a normal drive, the spring brakes are held back by _____.
23.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
24.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
25.
What is the function of a safety valve?