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
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
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
Excessive use of the service brakes results in overheating which can lead to:
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
A mechanical device that drops a low air warning into a drivers view is called a:
If your vehicle has an alcohol evaporator, it is there to:
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
While applying the brakes, what tells the driver how much air pressure is being used?
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
The type of brakes that clamp the rotor between the brake shoes is:
Generally, air governor cut-in should be at:
What happens when your brake drums get very hot?
The safety valve is set automatically when pressure is:
Air braking takes more time than hydraulic braking because:
The manual adjustment of automatic slack adjusters is:
How should you check that your service brakes are working properly?
Average stopping distance under normal conditions at 55 mph is:
The S-cam:
The most common problem found in roadside inspections is:
All of the following apply if the low air pressure warning signal does not work except:
At what level will the low air warning usually take effect?
Automatic adjusters should ________.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
The parking brake should be used: