Free Colorado CDL Air Brakes Practice Test 2022

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

Our CDL practice tests:
Based on 2022 CO commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
CO CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
Air tanks need to be drained ______.
2.
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.
3.
To test the vehicle's service brakes, move the vehicle:
4.
A mechanical device that drops a low air warning into a drivers view is called a:
5.
Excessive heat caused by using your brakes too often can also cause:
6.
If your vehicle has an alcohol evaporator, it is there to:
7.
In a controlled braking emergency:
8.
Your brakes are fading when:
9.
Spring brakes will generally come on at:
10.
While applying the brakes, what tells the driver how much air pressure is being used?
11.
When the air system is low ________.
12.
When should the spring brakes activate?
13.
When your brake's main air pressure is lost ________.
14.
What is a \"Wig Wag\"
15.
All of the following are factors in total stopping distance except:
16.
How should you check that your service brakes are working properly?
17.
Under normal braking conditions, the vehicle:
18.
The most common problem found in roadside inspections is:
19.
Pushing the brake pedal down harder __________.
20.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
21.
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:
22.
The braking power of the spring brakes ______.
23.
Brake drums or discs _______.
24.
Spring brakes are applied:
25.
Vehicles without automatic air tank drains need to be checked manually to remove ________?