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
The air compressor stops pumping air at what psi?
During normal driving, spring brakes are usually held back by:
All air brake equipped vehicles have:
At 55 mph on dry pavement, the air brake lag distance is how many feet?
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
To stop the vehicle, air brakes systems use:
The type of brakes that clamp the rotor between the brake shoes is:
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
When performing the controlled braking method for an emergency stop, you are _________.
Air governor cut-out should be at around:
What happens when your brake drums get very hot?
Besides heat, another cause of brake fade is:
After the initial pressure drop, air leakage for combination vehicles should be less than:
The trailer air supply knob is usually:
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
The brake pedal in an air brake system _______.
Stop light switches are necessary because ________.
How does the antilock brake system benefit the driver?
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
The governor stops the compressor from pumping air at:
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
In a dual air brake system, one system will typically control the rear brakes, and the other:
What is an alternative name for a brake pedal?
The warning light and buzzer will come on when the air pressure in either system drops below what psi?