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 parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
2.
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
3.
Why drain water from compressed air tanks?
4.
Excessive heat caused by using your brakes too often can also cause:
5.
6.
The supply pressure gauge shows how much pressure:
7.
Spring brakes will generally come on at:
8.
When does the air compressor governor allow air to start pumping?
9.
If the air compressor should develop a leak, what keeps the air in the tanks?
10.
Spring brakes will come on automatically, but the parking brake can also be applied _____.
11.
What is a \"Wig Wag\"
12.
After the initial pressure drop, air leakage for single vehicles should be less than:
13.
In case of emergency stops, drivers should:
14.
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
15.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
16.
With air brake vehicles, the parking brakes should be used:
17.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
18.
If air supply drops when driving, the tractor protection valve ________.
19.
The safety valve in the air compressor tank is set to open at _____.
20.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
21.
What does the air compressor governor control?
22.
Spring brakes are applied:
23.
A warning to drivers behind you that the air brakes have been applied is the:
24.
To prevent too much pressure from building up in the system, what is installed?
25.
To test the parking brake you should _______.