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
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
An air compressor can be cooled by _______.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
The most important thing to do when a low air pressure warning comes on is:
A mechanical device that drops a low air warning into a drivers view is called a:
On a long or steep downgrade, the foot brakes should be used:
Where is the modulating control valve located on some vehicles?
What negatively affects the braking power of a spring brake?
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
In most newer vehicles, the parking brake control will be:
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
If the low air warning comes on while you are driving, you should:
The safety valve reduces pressure at ___ psi.
When brakes are applied, the brake shoes will press against the:
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
How should you check that your service brakes are working properly?
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
To test the parking brake, stop the vehicle, put the parking brake on, and:
Controlled braking is only possible _________.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
The braking power of the spring brakes ______.
If the air compressor has its own oil supply you should do what before driving?
Vehicles with air brakes _________.