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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. What is a dual air brake system?
2 separate air brake systems: one system operates the left brakes, the other system operates the right brakes.
2 separate air brake systems: one system operates the front brakes, the other system operates the rear brakes.
2 separate air brake systems: one system for daytime driving, the other system for nighttime driving.
None of the above.
2. The tractor protection valve:
provides the air supply for the brake system.
will close if you apply the parking brakes.
will close automatically if the air pressure drops to a certain level.
All of the above.
3. Brake drums or discs must not have cracks longer than ____ the width of the friction area.
4. To test the low pressure warning signal, you should:
check the air hoses connected to the brake chambers to make sure they aren't cut.
manually let the air out of your brakes and see if the signal comes on.
shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
pump the brakes while your vehicle is running.
5. If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?
Every 4 hours.
At the end of each working day.
At least once a month.
Once a week.
6. Air tanks must be drained because:
if you don't drain the tanks yourself, your battery fluid may drain out.
compressed air usually has some water in it. The water can freeze in cold weather and cause brake failure.
when you push the brake pedal, air is let into each brake chamber.
if one air system is low on pressure, the rear brakes will not be operating fully.
7. The tire load rating is stated:
on the side of each tire.
on the dashboard.
inside the suspension system.
on each axle.
8. How can you tell if your vehicle is equipped with ABS (anti-lock braking system)?
ABS is required on all vehicles manufactured on or after 2005.
ABS is required on all vehicles manufactured on or after 2000.
Trucks, buses, trailers, and converter dollies built after 1998 are required to have ABS.
There is no way to tell, ABS is still optional on all vehicle types.
9. The __________ keeps air from going out if the air compressor develops a leak.
emergency relay valve
air compressor drive belt
one-way check valve
tractor protection valve
10. You should NOT use the parking brakes if:
the brakes are cold.
the brakes are very hot.
the brakes are too dry.
All of the above.
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NE 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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