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
Air brakes consist of ________.
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
The safety valve discharges automatically at the pressure of:
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
How far should manual slack adjusters move before they need to be adjusted?
An air brake system is fully charged at what psi?
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
To make sure that the spring brakes come on automatically, do all of the following except:
Which braking system applies and releases the parking brakes when you use the parking brake control?
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
When parking a vehicle with a modulating control valve ________.
If the low air warning comes on while you are driving, you should:
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
What must the air pressure be, at minimum, in both parts of a dual air brake system?
What tells the driver how much air pressure is in the air tanks?
Repeatedly partially increasing and pressing the brake pedal may result in:
You should avoid using the parking brake when _______.
Brake drums should not have cracks longer than what length?
Stop light switches are necessary because ________.
If the air compressor has its own oil supply you should do what before driving?
Air tanks should be drained:
What is a wig wag ?
Manual air tank drains require:
Vehicles with ABS have malfunction lamps that are what color?
On a long or steep downgrade, how should vehicle speed be primarily controlled?