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 brakes consist of ________.
2.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
3.
The stop light switch:
4.
In case of a low air situation, the spring brakes should come on at:
5.
The supply pressure gauge shows how much pressure:
6.
Brake fade is caused by:
7.
If you must make an emergency stop, you should brake so you:
8.
With air brake vehicles, the parking brake should be used:
9.
To make sure that the spring brakes come on automatically, do all of the following except:
10.
When the safety valve releases air this indicates ___________.
11.
If your truck has a dual air brake system, and one of the systems is low on pressure:
12.
When checking the air pressure buildup, pressure should build:
13.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
14.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
15.
The service brake system ________.
16.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
17.
Brake linings should not be _______.
18.
Why should you drain water from compressed air tanks?
19.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
20.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
21.
What is the purpose of a supply pressure gauge?
22.
What is a wig wag ?
23.
To prevent too much pressure from building up in the system, what is installed?
24.
Vehicles with air brakes have pressure gauges connected to the _______.
25.
To test the parking brake you should _______.