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.
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
2.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
3.
A low pressure warning signal could be __________.
4.
The main factor in causing brake fade is:
5.
To stop the vehicle, air brakes systems use:
6.
When performing the controlled braking method for an emergency stop, you are _________.
7.
What should a driver do when the low air pressure warning signal comes on?
8.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
9.
When does the air compressor governor allow air to start pumping?
10.
The level at which the air compressor stops pumping air is:
11.
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
12.
The emergency spring brake release knob is:
13.
Average stopping distance under normal conditions at 55 mph is:
14.
A device that limits the amount of air provided to the front brakes is a:
15.
The trailer air supply knob is usually:
16.
To test the parking brake, stop the vehicle, put the parking brake on, and:
17.
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
18.
On newer vehicles what color is the parking brake knob?
19.
How does the antilock brake system benefit the driver?
20.
If air supply drops when driving, the tractor protection valve ________.
21.
Automatic adjusters should ________.
22.
The belt of a belt-driven air compressor should be ________.
23.
Vehicles with air brakes _________.
24.
What does ABS stand for?
25.
What is the function of a safety valve?