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

7. To use the controlled braking method, you should:

Apply the brakes as hard as possible without locking the wheels.

Apply the brakes with about half-force.

Apply the brakes until the wheels lock.

Pump the brakes.

The method of controlled braking involves applying the brakes as hard as you can without locking the wheels. If you need to make large steering adjustments while using controlled braking, you should remove your foot from the brake pedal, steer, then reapply the brakes.

8. In a vehicle with dual air brakes, a leak in one system ____ the second system.

Will always affect

May not affect

Is caused by

A dual air brake system is made up of two separate air brake systems. If there is an air leak in one system, it may not affect the other.

9. Air tank drains should:

Only be used by mechanics.

Only be used when it is wet outside.

Be used to drain the tanks completely.

In an air brake system, air tank drains are used to remove water and compressor oil from the air tanks. When operating a drain, be sure to drain the tank completely.

10. A safety valve is set to open at ____ pounds per square inch (psi).

100

150

200

The safety valve protects air tanks and the rest of an air brake system from accumulating too much air pressure. The safety valve is usually set to open at 150 psi.

11. Emergency brakes:

Are not required on vehicles with air brakes.

Are required only on buses.

Are required on all vehicles.

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

12. In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle.

A separate air tank can be used to release the spring brakes for a short period of time.

You can use the spring brakes to continue driving normally.

The air tanks will automatically refill to a safe air pressure level.

In a vehicle with dual parking control valves, there is a separate air tank that can be used to temporarily release the spring brakes if they have been activated due to low air pressure. Pushing in the proper control will release the spring brakes for a short period of time, allowing the driver to move the vehicle in an emergency.

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