Free Delaware CDL Air Brakes Practice Test 2022

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 2022 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
List of questions
1.
The most common type of foundation brakes are:
2.
Air brakes consist of ________.
3.
When inspecting air brakes:
4.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
5.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
6.
During normal driving, spring brakes are usually held back by:
7.
A dual air brake system ________.
8.
A mechanical device that drops a low air warning into a drivers view is called a:
9.
If your vehicle has an alcohol evaporator, it is there to:
10.
On a long or steep downgrade, the foot brakes should be used:
11.
Spring brakes will generally come on at:
12.
What happens when your brake drums get very hot?
13.
The safety valve is set automatically when pressure is:
14.
The level at which the air compressor stops pumping air is:
15.
The air compressor governor controls:
16.
After the initial pressure drop, air leakage for single vehicles should be less than:
17.
Average stopping distance under normal conditions at 55 mph is:
18.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
19.
Controlled braking is only possible _________.
20.
The most common type of foundation brake is?
21.
The governor stops the compressor from pumping air at:
22.
Manual air tank drains require:
23.
On a long or steep downgrade, how should vehicle speed be primarily controlled?
24.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?
25.
Water and oil _______.