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.
When inspecting air brakes:
2.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
3.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
4.
What should a driver do when the low air pressure warning signal comes on?
5.
When parking a vehicle with a modulating control valve ________.
6.
When using a vehicle with air brakes, the parking needs to be used _______.
7.
When your brake's main air pressure is lost ________.
8.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
9.
If the low air warning comes on while you are driving, you should:
10.
Spring brakes will come on automatically, but the parking brake can also be applied:
11.
To stop the vehicle, the brake shoes and linings are pushed against:
12.
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
13.
If you need to make an emergency stop, you should brake so that you can ________.
14.
How should the air leakage rate be tested?
15.
Automatic air tanks _______.
16.
On newer vehicles what color is the parking brake knob?
17.
At what level will the low air warning usually take effect?
18.
The air compressor is connected to the engine through ______.
19.
Why should air tanks be drained completely?
20.
You should use the parking brake _____________.
21.
What does the air compressor governor control?
22.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
23.
Air tanks should be drained:
24.
Vehicles with ABS have malfunction lamps that are what color?
25.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?