Free North Carolina CDL Air Brakes Practice Test 2023

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 2021 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
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
How far should manual slack adjusters move before they need to be adjusted?
If your vehicle has an alcohol evaporator, it is there to:
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
Your brakes are fading when:
If you must make an emergency stop, you should brake so you:
The type of brakes that clamp the rotor between the brake shoes is:
When increased application pressure to maintain the same speed becomes necessary, you should ______.
Which braking system applies and releases the parking brakes when you use the parking brake control?
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
The level at which the air compressor stops pumping air is:
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
If your vehicle has an alcohol evaporator, every day during cold weather you should:
The most common problem found in roadside inspections is:
If air supply drops when driving, the tractor protection valve ________.
Automatic adjusters should ________.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
The belt of a belt-driven air compressor should be ________.
The parking brake should be used:
The governor stops the compressor from pumping air at:
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?
What is an alternative name for a brake pedal?
To test the parking brake you should _______.