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Free Arizona CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or L endorsement for your commercial driving license? The Arizona 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 Arizona CDL practice test questions are based on the Arizona 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 with our free CDL practice test to get ready to pass the Arizona Air Brake Test now. 

Our CDL practice tests:
Based on 2021 AZ commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
AZ CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
Study now
List of questions
1.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
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.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
4.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
5.
How far should manual slack adjusters move before they need to be adjusted?
6.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
7.
To test the vehicle's service brakes, move the vehicle:
8.
If your vehicle has an alcohol evaporator, it is there to:
9.
The main factor in causing brake fade is:
10.
While applying the brakes, what tells the driver how much air pressure is being used?
11.
The low air pressure warning signal indicates:
12.
When you release the brakes and reduce the air pressure what makes up for that air loss?
13.
What should a driver do when the low air pressure warning signal comes on?
14.
When does the air compressor governor allow air to start pumping?
15.
The level at which the air compressor stops pumping air is:
16.
What tells the driver how much air pressure is in the air tanks?
17.
The trailer air supply knob is usually:
18.
To stop the vehicle, the brake shoes and linings are pushed against:
19.
Repeatedly partially increasing and pressing the brake pedal may result in:
20.
Controlled braking is only possible _________.
21.
On newer vehicles what color is the parking brake knob?
22.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
23.
What is used to put alcohol into the system and reduce ice risk?
24.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?
25.
What happens when pressure is put on the air brakes?
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