# 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.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
2.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
3.
A dual air brake system ________.
4.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
5.
Under normal conditions, in order to engage the parking brakes the driver should:
6.
Emergency stab braking is:
7.
On a long or steep downgrade, the foot brakes should be used _______.
8.
With air brake vehicles, the parking brake should be used:
9.
When you release the brakes and reduce the air pressure what makes up for that air loss?
10.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
11.
Another name for the brake pedal is the "foot valve", or:
12.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
13.
Air governor cut-out should be at around:
14.
15.
The air compressor governor controls:
16.
The emergency spring brake release knob is:
17.
On newer vehicles what color is the parking brake knob?
18.
How should the air leakage rate be tested?
19.
The most common type of foundation brake is?
20.
Initial air leakage rate for combination vehicles should be:
21.
Why should air tanks be drained completely?
22.
During a normal drive, the spring brakes are held back by _____.
23.
To check the air compressor governor's "cut in" and "cut out" pressures you need to _________.
24.
What is used to put alcohol into the system and reduce ice risk?
25.
What does ABS stand for?