Free California CDL Air Brakes Practice Test 2022

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 2022 CA commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
CA CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The air compressor stops pumping air at what psi?
2.
To test air service brakes you should:
3.
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
4.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
5.
An air compressor can be cooled by _______.
6.
When inspecting air brakes:
7.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
8.
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
9.
Brake fade is caused by:
10.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
11.
What is the purpose of an antilock braking system (ABS)?
12.
When using a vehicle with air brakes, the parking needs to be used _______.
13.
The parking brake knob is usually:
14.
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
15.
Pressing and releasing the brake pedal unnecessarily:
16.
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:
17.
A device that limits the amount of air provided to the front brakes is a:
18.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
19.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
20.
Which of the following helps the stop light switch work?
21.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
22.
The belt of a belt-driven air compressor should be ________.
23.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
24.
Vehicles with air brakes have pressure gauges connected to the _______.
25.
If your brakes are wet, what should you do to dry them quicker?