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
Full answers + detailed explanations
Perfect for first-time, renewal applicants
NJ CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
The air compressor stops pumping air at what psi?
When inspecting air brakes:
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
Excessive heat caused by using your brakes too often can also cause:
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
Spring brakes will generally come on at:
With air brake vehicles, the parking brake should be used:
Which braking system applies and releases the parking brakes when you use the parking brake control?
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
Spring brakes will come on automatically, but the parking brake can also be applied:
The safety valve is set automatically when pressure is:
The parking brake knob is usually:
Air braking takes more time than hydraulic braking because:
Average stopping distance under normal conditions at 55 mph 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 you need to make an emergency stop, you should brake so that you can ________.
The most common type of foundation brake is?
During a normal drive, the spring brakes are held back by _____.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
What is a wig wag ?
To prevent too much pressure from building up in the system, what is installed?
In a dual air brake system, one system will typically control the rear brakes, and the other:
Vehicles with air brakes have pressure gauges connected to the _______.