# Free Alabama CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Alabama 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 Alabama 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 Alabama CDL practice test to get ready to pass your Alabama CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 AL commercial driver's license manual
Perfect for first-time, renewal applicants
AL CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
An air compressor can be cooled by _______.
2.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
3.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
4.
Excessive heat caused by using your brakes too often can also cause:
5.
Spring brakes will generally come on at:
6.
The application pressure gauge shows how much air pressure you:
7.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
8.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
9.
Generally, air governor cut-in should be at:
10.
In most newer vehicles, the parking brake control will be:
11.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
12.
The safety valve is set automatically when pressure is:
13.
If the spring brakes are on, when should you push the brake pedal?
14.
15.
In case of emergency stops, drivers should:
16.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the _____.
17.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
18.
How are brakes designed?
19.
The air tanks must be drained because:
20.
Why should you drain water from compressed air tanks?
21.
The safety valve in the air compressor tank is set to open at _____.
22.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
23.
How often should alcohol containers be checked during cold weather?
24.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
25.
If your brakes are wet, what should you do to dry them quicker?