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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. If you are being tailgated, you should:
turn on your taillights.
drive on the shoulder.
try to let the other vehicle pass.
speed up.
2. Weight that is loaded so there is a high center of gravity:
causes greater chance of rollover.
reduces the chance that the load will shift to the side or fall off.
makes a vehicle easier to handle.
All of the above.
3. Why should you check your mirrors regularly to know where other vehicles are around you?
To flash the brake lights if you are being tailgated.
To know whether you can make a quick lane change in an emergency.
To move out of their way if they want to get past.
To better assess your own speed.
4. Spring brakes are usually held back by:
air pressure.
modulating control valves.
the brake pedal.
the antilock braking system.
5. Overloading a vehicle with cargo can have negative effects on all of the following except:
Speed control
Weight limits
6. Air tanks must be drained completely to:
put alcohol into the air system.
remove all the air.
remove all moisture and oil.
pump water and compressor oil into the tanks.
7. Supply pressure gauges tell you:
when the pressure in the system drops below 60 psi.
how much pressure is in the air tanks.
how much air pressure you are applying to the brakes.
when the air pressure in the tanks falls below 60 psi.
8. The tractor protection valve:
provides the air supply for the brake system.
will close automatically if the air pressure drops to a certain level.
will close if you apply the parking brakes.
All of the above.
9. How can you tell if your vehicle is equipped with ABS?
Look under the vehicle for the wheel speed sensor wires coming from the back of the brakes.
Look for yellow ABS malfunction lamps on the instrument panel.
Trailers will have yellow ABS malfunction lamps on the left side.
All of the above.
10. The most common foundation brakes found on vehicles with air brakes are the:
parking brakes.
S-cam brakes.
wedge brakes.
disc brakes.
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NJ CDL Air Brakes Test

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