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.
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
2.
The safety valve discharges automatically at the pressure of:
3.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
4.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
5.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
6.
Why drain water from compressed air tanks?
7.
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
8.
The low air pressure warning signal indicates:
9.
The type of brakes that clamp the rotor between the brake shoes is:
10.
When using a vehicle with air brakes, the parking needs to be used _______.
11.
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
12.
The parking brake should not be used when wet in freezing temperatures, or:
13.
If air pressure is not built up within the correct amount of time, then:
14.
The S-cam:
15.
Controlled braking is only possible _________.
16.
You should avoid using the parking brake when _______.
17.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
18.
Why do air brakes take longer to stop than hydraulic brakes?
19.
What is used to put alcohol into the system and reduce ice risk?
20.
The spring brakes of a tractor will come on when the air pressure falls within _______.
21.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
22.
What is the purpose of an air storage tank?
23.
Manual air tank drains require:
24.
In a dual air brake system, one system will typically control the rear brakes, and the other:
25.
What is an alternative name for a brake pedal?