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.
A low pressure warning signal could be __________.
2.
Excessive use of the service brakes results in overheating which can lead to:
3.
Under normal conditions, in order to engage the parking brakes the driver should:
4.
If your vehicle has an alcohol evaporator, it is there to:
5.
The ____ shows how much pressure is in the air tanks.
6.
When the air system is low ________.
7.
The type of brakes that clamp the rotor between the brake shoes is:
8.
Which braking system applies and releases the parking brakes when you use the parking brake control?
9.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
10.
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
11.
What happens when your brake drums get very hot?
12.
The manual adjustment of automatic slack adjusters is:
13.
Average stopping distance under normal conditions at 55 mph is:
14.
How should you check that your service brakes are working properly?
15.
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:
16.
Pressing and releasing the brake pedal unnecessarily:
17.
Why should you drain water from compressed air tanks?
18.
If air supply drops when driving, the tractor protection valve ________.
19.
Initial air leakage rate for combination vehicles should be:
20.
Automatic adjusters should ________.
21.
To check the air compressor governor's "cut in" and "cut out" pressures you need to _________.
22.
What is the purpose of a supply pressure gauge?
23.
The parking brake should be used:
24.
A warning to drivers behind you that the air brakes have been applied is the:
25.
What does ABS stand for?