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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the New Jersey CDL knowledge test. The NJ CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the New Jersey CDL Manual. Take this NJ CDL practice test now to prepare for the actual air brakes test!
1. Which of the following is not a type of retarder?
2. The best way to recognize that your trailer has started to skid is:
by seeing it in your mirrors.
by recognizing tire failure.
by opening the window and feeling the front of the mirror.
by feeling the brakes come on.
3. If the low air pressure warning light comes on, you should:
stop immediately.
continue to drive normally.
call for help.
set the parking brake.
4. With the air pressure built up to governor cutoff, the maximum leakage rates per minute are ___ psi for single vehicles and ___ psi for a combination of 2 vehicles.
5; 6
3; 2
4; 5
3; 4
5. When the spring brakes are on, you should never:
decrease your speed.
push the brake pedal down.
change lanes.
6. In vehicles with air brakes, the two markings on a front brake limiting valve are:
normal and slippery.
left and right.
wet and dry.
high and low.
7. You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
The brake pedal feels spongy or goes to the floor.
The steering feels heavy.
You hear a loud "bang".
You have to apply your brakes harder and harder to get the same stopping power.
8. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
left; left
right; right
right; left
left; right
9. Front wheel braking is good:
under all conditions.
only in wet conditions.
only in good weather.
10. When driving a 60 foot truck at 35 mph in ideal conditions, you should keep at least _______ of space in front of you.
5 seconds
4 seconds
12 seconds
6 seconds
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NJ CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Number of questions: 25
Correct answers to pass:20
Passing score:80%
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