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.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
2.
The stop light switch:
3.
During normal driving, spring brakes are usually held back by:
4.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
5.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
6.
The most important thing to do when a low air pressure warning comes on is:
7.
On a long or steep downgrade, the foot brakes should be used:
8.
The application pressure gauge shows how much air pressure you:
9.
When the air system is low ________.
10.
When your brake's main air pressure is lost ________.
11.
If the air compressor should develop a leak, what keeps the air in the tanks?
12.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
13.
The safety valve reduces pressure at ___ psi.
14.
All of the following are factors in total stopping distance except:
15.
After the initial pressure drop, air leakage for single vehicles should be less than:
16.
What tells the driver how much air pressure is in the air tanks?
17.
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
18.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
19.
To test the parking brake, stop the vehicle, put the parking brake on, and:
20.
All of the following apply if the low air pressure warning signal does not work except:
21.
The most common type of foundation brake is?
22.
Why should you drain water from compressed air tanks?
23.
Stop light switches are necessary because ________.
24.
How often should alcohol containers be checked during cold weather?
25.
Vehicles with ABS have malfunction lamps that are what color?