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.
Air brakes consist of ________.
2.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
3.
All air brake equipped vehicles have:
4.
Emergency stab braking is:
5.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
6.
When should the spring brakes activate?
7.
Normally during anti-lock braking, the driver:
8.
Generally, air governor cut-in should be at:
9.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
10.
When using a vehicle with air brakes, the parking needs to be used _______.
11.
Why is manually adjusting automatic slack adjusters dangerous?
12.
When brakes are applied, the brake shoes will press against the:
13.
When checking the air pressure buildup, pressure should build:
14.
The manual adjustment of automatic slack adjusters is:
15.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
16.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
17.
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
18.
If the air compressor has its own oil supply you should do what before driving?
19.
On large buses low pressure warning devices usually signal at ______.
20.
What is used to put alcohol into the system and reduce ice risk?
21.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
22.
What is the purpose of an air storage tank?
23.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?
24.
Water and oil _______.
25.
What happens when pressure is put on the air brakes?