There are two air brake systems in a dual air brake system. The systems share a set of brake controls, but each system has its own tanks, hoses, and lines.

Each system has its own air tanks.

Air tanks are shared between both systems.

Each system has its own air tanks.

You must designate which system you are using.

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.

Are not required on vehicles with air brakes.

On a long or steep downgrade, brakes should only be used to supplement the braking effect of the engine. Apply the brakes just enough to feel a definite slowing down, then release them once you are about 5 mph below your target "safe" speed. Once your vehicle reaches its safe speed again, repeat this process.

Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.

Ride the brakes all the way down the hill.

Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.

Apply the brakes only near the bottom of the downgrade.

Apply consistent pressure to the brake pedal all the way down the hill.

Brakes are designed to take a lot of heat, but drivers should not rely solely on the brakes to slow their vehicle. Brakes may fade and lose their ability to slow down the vehicle if they become too hot, so drivers should also rely on the engine braking effect.

The brakes may squeak more than usual.

The brakes will brake unevenly.

Air Brakes Endorsement Test | Nebraska 2026 #2 Page 4 of 4

Train for FREE online with our Nebraska CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a NE Class A/Class B driver license in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

Air Brakes Endorsement Test | Nebraska 2026 #2 Page 4 of 4

19 . Both systems in a dual air brake systems share:

20 . What color are ABS malfunction lamps?

21 . An emergency brake must be controlled by:

22 . In a dual air brake system:

23 . Emergency brakes:

24 . When traveling down a steep downgrade, the best way to use your brakes is to:

25 . Using the brakes creates heat. If too much heat is produced:

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