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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 low air pressure warning signal is ________.
2.
Excessive use of the service brakes results in overheating which can lead to:
3.
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
4.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
5.
Emergency stab braking is:
6.
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
7.
Why drain water from compressed air tanks?
8.
Where is the modulating control valve located on some vehicles?
9.
The type of brakes that clamp the rotor between the brake shoes is:
10.
When parking a vehicle with a modulating control valve ________.
11.
Why is manually adjusting automatic slack adjusters dangerous?
12.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
13.
The manual adjustment of automatic slack adjusters is:
14.
Pressing and releasing the brake pedal unnecessarily _____.
15.
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
16.
After the initial pressure drop, air leakage for combination vehicles should be less than:
17.
Under normal braking conditions, the vehicle ______.
18.
The most common problem found in roadside inspections is:
19.
To test the parking brake, stop the vehicle, put the parking brake on, and:
20.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
21.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
22.
The brake pedal in an air brake system _______.
23.
Pushing the brake pedal down harder __________.
24.
How are brakes designed?
25.
What does ABS stand for?
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