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 safety valve discharges automatically at the pressure of:
2.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
3.
A low pressure warning signal could be __________.
4.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
5.
The most important thing to do when a low air pressure warning comes on is:
6.
In case of a low air situation, the spring brakes should come on at:
7.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
8.
The main factor in causing brake fade is:
9.
The type of brakes that clamp the rotor between the brake shoes is:
10.
Air governor cut-out should be at around:
11.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
12.
What is the purpose of an antilock braking system (ABS)?
13.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
14.
The parking brake knob is usually:
15.
Besides heat, another cause of brake fade is:
16.
What tells the driver how much air pressure is in the air tanks?
17.
How should you check that your service brakes are working properly?
18.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
19.
The service brake system ________.
20.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
21.
How are brakes designed?
22.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
23.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
24.
Why should you drain water from compressed air tanks?
25.
What is a wig wag ?