# Free New Jersey CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The New Jersey 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 NJ 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 CDL Practice Test NJ to get ready to pass the New Jersey CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 NJ commercial driver's license manual
Perfect for first-time, renewal applicants
NJ CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
2.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
3.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
4.
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
5.
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
6.
If your vehicle has an alcohol evaporator, it is there to:
7.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
8.
While applying the brakes, what tells the driver how much air pressure is being used?
9.
The low air pressure warning signal indicates:
10.
The type of brakes that clamp the rotor between the brake shoes is:
11.
When you release the brakes and reduce the air pressure what makes up for that air loss?
12.
Air governor cut-out should be at around:
13.
What is a \"Wig Wag\"
14.
15.
A device that limits the amount of air provided to the front brakes is a:
16.
After the initial pressure drop, air leakage for combination vehicles should be less than:
17.
All of the following apply if the low air pressure warning signal does not work except:
18.
Why does a heavily loaded vehicle need a longer distance to stop?
19.
Brake drums should not have cracks longer than what length?
20.
How are brakes designed?
21.
Which of the following helps the stop light switch work?
22.
The safety valve in the air compressor tank is set to open at _____.
23.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
24.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
25.
What is the purpose of an air storage tank?