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.
The most common type of foundation brakes are:
2.
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
3.
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
4.
On a long or steep downgrade, the foot brakes should be used:
5.
What negatively affects the braking power of a spring brake?
6.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
7.
Which braking system applies and releases the parking brakes when you use the parking brake control?
8.
Air governor cut-out should be at around:
9.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
10.
If the low air warning comes on while you are driving, you should:
11.
After the initial pressure drop, air leakage for single vehicles should be less than:
12.
Besides heat, another cause of brake fade is:
13.
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:
14.
After the initial pressure drop, air leakage for combination vehicles should be less than:
15.
To stop the vehicle, the brake shoes and linings are pushed against:
16.
If you need to make an emergency stop, you should brake so that you can ________.
17.
At what level will the low air warning usually take effect?
18.
Brake drums should not have cracks longer than what length?
19.
Why should you check the brake adjustment often?
20.
The air compressor is connected to the engine through ______.
21.
Why should air tanks be drained completely?
22.
The safety valve in the air compressor tank is set to open at _____.
23.
To check the air compressor governor's "cut in" and "cut out" pressures you need to _________.
24.
The parking brake should be used:
25.
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?