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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. Most heavy vehicles require ________ change gears.
triple shifting
double clutching
double shifting
single clutching
2. Parking brakes are:
not required on commercial vehicles with air brakes.
required on all vehicles.
not required on trailers.
not required on buses.
3. If your trucks has a high center of gravity, which of the following is true for curves?
You should slow down, as your truck can roll over at the posted speed limit for the curve.
You should travel at the posted speed limit.
Reduce your speed to a crawl.
None of the above.
4. Slack adjusters:
regulate the distance between the rear wheels.
are available in four types: manual, automatic, robotic and analog.
should move more than one inch where the push rods attach to them.
regulate the distance that the air brake has to travel to apply friction to the wheel.
5. A low air pressure warning signal must come on when the air pressure in the tanks falls below:
15 psi.
10 psi.
60 psi.
100 psi.
6. When going down a steep downgrade, you should:
use the parking brake.
use escape ramps whenever possible.
use a low gear, and a proper braking technique.
avoid braking and rely on engine braking.
7. Too little weight on the driving axles can cause:
poor visibility.
longer stopping distances.
mechanical damage.
poor traction.
8. Which of the following is NOT a warning sign of fatigue?
Trouble remembering the last few miles driven
Frequent blinking
Heavy eyelids
Driving at the speed of the traffic
9. When backing, you should:
back quickly.
use the mirrors on both sides.
only use mirror on the driver's side.
back and turn toward the right side whenever possible.
10. When a tire fails, you must:
get out and check all the tires after you have come to a stop.
hold the steering wheel firmly.
stay off the brake.
All of the above.
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NJ Air Brakes Test

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