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.
To test air service brakes you should:
2.
The most common type of foundation brakes are:
3.
When inspecting air brakes:
4.
A dual air brake system ________.
5.
Under normal conditions, in order to engage the parking brakes the driver should:
6.
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
7.
Where is the modulating control valve located on some vehicles?
8.
When does the air compressor governor allow air to start pumping?
9.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
10.
Air braking takes more time than hydraulic braking because:
11.
Besides heat, another cause of brake fade is:
12.
After the initial pressure drop, air leakage for combination vehicles should be less than:
13.
The S-cam:
14.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
15.
At what level will the low air warning usually take effect?
16.
How should the air leakage rate be tested?
17.
On newer vehicles what color is the parking brake knob?
18.
The air compressor is connected to the engine through ______.
19.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
20.
Vehicles with air brakes _________.
21.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
22.
What is a wig wag ?
23.
A warning to drivers behind you that the air brakes have been applied is the:
24.
To prevent too much pressure from building up in the system, what is installed?
25.
Manual air tank drains require: