Instructions

Air Brakes

This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice.. Read More

This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Nevada Commercial Driver License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.

Number of Question 25

Passing Score 20

1. If the air pressure warning light comes on, you should:

Continue to drive normally.

Drive with one foot on the accelerator and one foot on the brake pedal.

Call the local law enforcement agency.

Safely exit the roadway and stop.

If the low air pressure warning signals activate, it is essential that you bring the vehicle to a safe stop while you are still able to control the brakes.

2. Air pressure should build up in a single air system within:

15 minutes.

12 minutes.

Three minutes.

One minute.

In a vehicle with a single air brake system, after the engine is at operating rpms, the pressure in the air system should generally build from 50 to 90 psi within three minutes.

3. Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.

Squishy brakes.

Too much air collecting in the tanks.

In an air brake system, the air tanks must be periodically drained to remove accumulations of water and compressor oil. If water is not removed, it could freeze in cold weather and cause brake failure.

4. If you are driving and the ABS light comes on, it means that the ABS:

Cannot work due to weather conditions.

Has just been activated.

Is not working properly.

ABS malfunction lamps indicate that something in the Anti-Lock Braking System is not working properly.

5. On a truck with air brakes, the braking system’s air compressor:

Pumps air into the air storage tanks.

Fills the tires.

Moves air to the back of the truck.

Cleans the brakes.

In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor.

6. Some air brake systems introduce alcohol into the system to:

Make the brakes work without squeaking.

Prevent ice from forming in the brake system.

Prevent people from breathing the air from the system.

Some air brake systems contain an alcohol evaporator. An evaporator introduces alcohol into the system to help inhibit the formation of ice in cold weather.

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