Free Arizona CDL Air Brakes Practice Test 2022

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 2022 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
List of questions
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
The most important thing to do when a low air pressure warning comes on is:
Excessive heat caused by using your brakes too often can also cause:
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
What is the purpose of an antilock braking system (ABS)?
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
The safety valve reduces pressure at ___ psi.
All of the following are factors in total stopping distance except:
After the initial pressure drop, air leakage for single vehicles should be less than:
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
With air brake vehicles, the parking brakes should be used:
You should avoid using the parking brake when _______.
The service brake system ________.
Why does a heavily loaded vehicle need a longer distance to stop?
Brake drums should not have cracks longer than what length?
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
If air supply drops when driving, the tractor protection valve ________.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
The parking brake should be used:
The governor stops the compressor from pumping air at:
In a dual air brake system, one system will typically control the rear brakes, and the other: