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When a vehicle's service brakes fail to apply, emergency brakes can be applied by using the:

Option 1: brake pedal.
Option 2: spring brake control valve.
Option 3: tractor protection valve.
Option 4: trailer hand valve.

Answer :

Final answer:

In the case of service brake failure, the the spring brake control valve is utilized to apply the emergency brakes. It enables the application of these brakes via a separate mechanical system.

Explanation:

When a vehicle's service brakes fail to apply, the correct option for applying emergency brakes would be the spring brake control valve. Emergency brakes, also known as parking brakes, often operate through a mechanical system that is independent of the regular hydraulic brake system. The spring brake control valve allows for the application of the emergency brakes should the service brakes fail. This valve, through the use of air pressure, causes the spring brakes to engage when needed, thus ensuring the vehicle can still come to a stop even if the primary brake system has issues.

Learn more about Brake System here:

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