# 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
Perfect for first-time, renewal applicants
KY CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
2.
Excessive use of the service brakes results in overheating which can lead to:
3.
Air tanks need to be drained ______.
4.
On a long or steep downgrade, the foot brakes should be used:
5.
If your vehicle has an alcohol evaporator, it is there to:
6.
Spring brakes will generally come on at:
7.
8.
If you must make an emergency stop, you should brake so you:
9.
What negatively affects the braking power of a spring brake?
10.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
11.
If you must make an emergency stop, you should brake so you:
12.
If the low air warning comes on while you are driving, you should:
13.
Spring brakes will come on automatically, but the parking brake can also be applied:
14.
15.
Air braking takes more time than hydraulic braking because:
16.
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
17.
In case of emergency stops, drivers should:
18.
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
19.
With air brake vehicles, the parking brakes should be used:
20.
To test the parking brake, stop the vehicle, put the parking brake on, and:
21.
The service brake system ________.
22.
Which of the following helps the stop light switch work?
23.
Brake drums or discs _______.
24.
During a normal drive, the spring brakes are held back by _____.
25.
Vehicles without automatic air tank drains need to be checked manually to remove ________?