# 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
1.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
2.
All air brake equipped vehicles have:
3.
Air tanks need to be drained ______.
4.
Why drain water from compressed air tanks?
5.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
6.
When the air system is low ________.
7.
Generally, air governor cut-in should be at:
8.
When the safety valve releases air this indicates ___________.
9.
When parking a vehicle with a modulating control valve ________.
10.
If the spring brakes are on, when should you push the brake pedal?
11.
What must the air pressure be, at minimum, in both parts of a dual air brake system?
12.
Which of these is NOT a proper time to apply the parking brakes?
13.
What tells the driver how much air pressure is in the air tanks?
14.
The trailer air supply knob is usually:
15.
With air brake vehicles, the parking brakes should be used:
16.
The brake pedal in an air brake system _______.
17.
At what level will the low air warning usually take effect?
18.
If one air system is very low on pressure _______.
19.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
20.
Stab braking should only be used:
21.
You should use the parking brake _____________.
22.
What does the air compressor governor control?
23.
The parking brake should be used:
24.
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?
25.
What is an alternative name for a brake pedal?