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Free Delaware CDL Air Brakes Practice Test 2023

Do you need a Delaware 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 Delaware CDL Practice test questions are based on the Delaware 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 free CDL practice test to get ready to pass the Delaware CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 DE commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
DE CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
Study now
List of questions
1.
The air compressor stops pumping air at what psi?
2.
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
3.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
4.
To test the vehicle's service brakes, move the vehicle:
5.
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
6.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
7.
While applying the brakes, what tells the driver how much air pressure is being used?
8.
With air brake vehicles, the parking brake should be used:
9.
What negatively affects the braking power of a spring brake?
10.
When the air system is low ________.
11.
When you release the brakes and reduce the air pressure what makes up for that air loss?
12.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
13.
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
14.
If air pressure is not built up within the correct amount of time, then:
15.
You should avoid using the parking brake when _______.
16.
The air tanks must be drained because:
17.
How does the antilock brake system benefit the driver?
18.
Automatic adjusters should ________.
19.
Stop light switches are necessary because ________.
20.
Initial air leakage rate for combination vehicles should be:
21.
How often should alcohol containers be checked during cold weather?
22.
On large buses low pressure warning devices usually signal at ______.
23.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
24.
A warning to drivers behind you that the air brakes have been applied is the:
25.
What is an alternative name for a brake pedal?
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