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
A low air pressure warning signal is ________.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
Excessive use of the service brakes results in overheating which can lead to:
To test the vehicle's service brakes, move the vehicle:
Under normal conditions, in order to engage the parking brakes the driver should:
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
In a controlled braking emergency:
If you must make an emergency stop, you should brake so you:
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
The level at which the air compressor stops pumping air is:
The emergency spring brake release knob is:
The S-cam:
To stop the vehicle, the brake shoes and linings are pushed against:
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
The most common problem found in roadside inspections is:
Why should you check the brake adjustment often?
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
Stop light switches are necessary because ________.
On large buses low pressure warning devices usually signal at ______.
How often should alcohol containers be checked during cold weather?
The spring brakes of a tractor will come on when the air pressure falls within _______.
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
What is the function of a safety valve?