# 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
1.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
2.
Air brakes consist of ________.
3.
The safety valve discharges automatically at the pressure of:
4.
A mechanical device that drops a low air warning into a drivers view is called a:
5.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
6.
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 the air system is low ________.
9.
Generally, air governor cut-in should be at:
10.
Which braking system applies and releases the parking brakes when you use the parking brake control?
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 your truck has a dual air brake system, and one of the systems is low on pressure:
14.
What must the air pressure be, at minimum, in both parts of a dual air brake system?
15.
When checking the air pressure buildup, pressure should build:
16.
The S-cam:
17.
How should the air leakage rate be tested?
18.
Automatic air tanks _______.
19.
Why should you drain water from compressed air tanks?
20.
The braking power of the spring brakes ______.
21.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
22.
If the air compressor has its own oil supply you should do what before driving?
23.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
24.
What is the function of a safety valve?
25.
If your brakes are wet, what should you do to dry them quicker?