Free North Carolina CDL Air Brakes Practice Test 2022

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The North Carolina CDL Air Brake test 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 NC 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 NC CDL Test to get ready to pass the North Carolina CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2022 NC commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
NC CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The air compressor stops pumping air at what psi?
2.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
3.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
4.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
5.
Excessive use of the service brakes results in overheating which can lead to:
6.
The main factor in causing brake fade is:
7.
The low air pressure warning signal indicates:
8.
With air brake vehicles, the parking brake should be used:
9.
To stop the vehicle, air brakes systems use:
10.
What negatively affects the braking power of a spring brake?
11.
When performing the controlled braking method for an emergency stop, you are _________.
12.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
13.
If the low air warning comes on while you are driving, you should:
14.
If you must make an emergency stop, you should brake so you:
15.
The parking brake knob is usually:
16.
If the low air pressure warning light comes on, you should:
17.
If air pressure is not built up within the correct amount of time, then:
18.
Under normal braking conditions, the vehicle:
19.
How are brakes designed?
20.
Brake linings should not be _______.
21.
Initial air leakage rate for combination vehicles should be:
22.
Why should air tanks be drained completely?
23.
The safety valve in the air compressor tank is set to open at _____.
24.
You should use the parking brake _____________.
25.
What does ABS stand for?