Free Kentucky CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Kentucky 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 CDL practice test packs are based on the KY CDL 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 our Kentucky CDL Practice Test to get ready to pass the Kentucky CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 KY commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
KY 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 __________.
A low pressure warning signal could be __________.
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
The most important thing to do when a low air pressure warning comes on is:
To test the vehicle's service brakes, move the vehicle:
Emergency stab braking is:
A mechanical device that drops a low air warning into a drivers view is called a:
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?
The low air pressure warning signal indicates:
Where is the modulating control valve located on some vehicles?
Normally during anti-lock braking, the driver:
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
If the spring brakes are on, when should you push the brake pedal?
The parking brake should not be used when wet in freezing temperatures, or:
Under normal braking conditions, the vehicle:
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
You should avoid using the parking brake when _______.
Why does a heavily loaded vehicle need a longer distance to stop?
At what level will the low air warning usually take effect?
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
If one air system is very low on pressure _______.
Stab braking should only be used:
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
What is the purpose of an air storage tank?