# Free California CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The California 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 California CDL practice test questions are based on the California Commercial Driver's 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 pack to get ready to pass the California CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 CA commercial driver's license manual
Perfect for first-time, renewal applicants
CA CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
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.
2.
A low pressure warning signal could be __________.
3.
The most important thing to do when a low air pressure warning comes on is:
4.
The ____ shows how much pressure is in the air tanks.
5.
The low air pressure warning signal indicates:
6.
Where is the modulating control valve located on some vehicles?
7.
To stop the vehicle, air brakes systems use _______.
8.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
9.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
10.
When the safety valve releases air this indicates ___________.
11.
In most newer vehicles, the parking brake control will be:
12.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
13.
The level at which the air compressor stops pumping air is:
14.
When checking the air pressure buildup, pressure should build:
15.
If air pressure is not built up within the correct amount of time, then:
16.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
17.
The service brake system ________.
18.
Pushing the brake pedal down harder __________.
19.
If one air system is very low on pressure _______.
20.
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
21.
Why should you drain water from compressed air tanks?
22.
How does the antilock brake system benefit the driver?
23.
Brake drums or discs _______.
24.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
25.
What happens when pressure is put on the air brakes?