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.
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
2.
A low air pressure warning signal is ________.
3.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
4.
To test the vehicle's service brakes, move the vehicle:
5.
Why drain water from compressed air tanks?
6.
While applying the brakes, what tells the driver how much air pressure is being used?
7.
To make sure that the spring brakes come on automatically, do all of the following except:
8.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
9.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
10.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
11.
The safety valve is set automatically when pressure is:
12.
What is a \"Wig Wag\"
13.
Average stopping distance under normal conditions at 55 mph is:
14.
Pressing and releasing the brake pedal unnecessarily:
15.
To stop the vehicle, the brake shoes and linings are pushed against:
16.
Repeatedly partially increasing and pressing the brake pedal may result in:
17.
With air brake vehicles, the parking brakes should be used:
18.
Controlled braking is only possible _________.
19.
The service brake system ________.
20.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
21.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
22.
Why do air brakes take longer to stop than hydraulic brakes?
23.
Brake drums or discs _______.
24.
Vehicles with air brakes have pressure gauges connected to the _______.
25.
What is the function of a safety valve?