Free Illinois CDL Air Brakes Practice Test 2022

Do you need an Illinois 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 CDL practice test packs are based on the Illinois 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 our Illinois CDL Practice Test to get ready to pass the Illinois CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2022 IL commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
IL 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.
Air brakes consist of ________.
3.
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
4.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
5.
The safety valve discharges automatically at the pressure of:
6.
In case of a low air situation, the spring brakes should come on at:
7.
A mechanical device that drops a low air warning into a drivers view is called a:
8.
Excessive heat caused by using your brakes too often can also cause:
9.
Your brakes are fading when:
10.
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
11.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
12.
When performing the controlled braking method for an emergency stop, you are _________.
13.
When brakes are applied, the brake shoes will press against the:
14.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
15.
If your truck has a dual air brake system, and one of the systems is low on pressure:
16.
The trailer air supply knob is usually:
17.
Repeatedly partially increasing and pressing the brake pedal may result in:
18.
Automatic air tanks _______.
19.
At what level will the low air warning usually take effect?
20.
How should the air leakage rate be tested?
21.
The belt of a belt-driven air compressor should be ________.
22.
What does the air compressor governor control?
23.
Spring brakes are applied:
24.
What is the purpose of an air storage tank?
25.
To test the parking brake you should _______.