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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 Nebraska CDL knowledge test. The NE 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 Nebraska CDL Manual. Take this NE CDL practice test now to prepare for the actual air brakes test!
1. Your truck has a dual air system. If either system is very low on pressure:
the low pressure warning signal will stop working.
either the front or the rear brake will not be fully operational.
the tractor protection valve will not work properly.
the ABS will not work properly.
2. If your vehicle is equipped with a front brake limiting valve, to ensure normal stopping power make sure the control is:
in the "neutral" position.
in the "normal" position.
in the "off" position.
in the "slippery" position.
3. Why must air tanks be drained?
There might not be enough antifreeze in the system.
Your transmission fluid may drain out.
The alcohol evaporator might stop working.
The water can freeze in cold weather and cause brake failure.
4. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
it is shaped like the letter "S".
it is a safe-driving brake.
"S" stands for "Shoes".
it applies a "Shock" to the brakes.
5. An Anti-lock Braking System (ABS):
increases your normal braking capability.
always shortens your stopping distance.
lets you drive faster.
keeps your wheels from locking up when you brake hard.
6. Most hydraulic brake failures occur for one of two reasons, one of which is:
excessive downshifting.
relying too much on the engine braking effect.
driving in cold weather.
loss of hydraulic pressure.
7. The trailer hand valve should:
never be used for parking.
be used in driving.
never be used to test the trailer brakes.
All of the above.
8. When you release the brake pedal, the _____ rotates back and a spring pulls the brake shoes away from the drum.
hydraulic brake system
air compressor belt
pressure gauge
9. You should check air pressure and temperature gauges:
at the beginning of each trip.
as often as is practical.
at the end of each trip.
every time you stop.
10. What is an important thing to remember about emergency braking?
Your natural response (hitting the brakes) is never the right solution.
You should never use stab braking.
The more heavily loaded semitrailer trailer should be in the rear.
Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
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NE Air Brakes CDL 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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