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 parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
The ____ shows how much pressure is in the air tanks.
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
Another name for the brake pedal is the "foot valve", or:
When your brake's main air pressure is lost ________.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
All of the following are factors in total stopping distance except:
What must the air pressure be, at minimum, in both parts of a dual air brake system?
After the initial pressure drop, air leakage for single vehicles should be less than:
Which of these is NOT a proper time to apply the parking brakes?
A device that limits the amount of air provided to the front brakes is a:
The S-cam:
If you need to make an emergency stop, you should brake so that you can ________.
Brake drums should not have cracks longer than what length?
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
The air compressor is connected to the engine through ______.
Why should you drain water from compressed air tanks?
The braking power of the spring brakes ______.
If air supply drops when driving, the tractor protection valve ________.
Spring brakes are applied:
Vehicles with ABS have malfunction lamps that are what color?