What is Dual Foot Valve? Air brake system

A Dual Foot Valve is a component of the air brake system that is used in heavy-duty vehicles such as trucks and buses. It is a type of foot valve that is divided into two sections, each controlling a separate circuit. The primary circuit is responsible for the rear axle brakes, while the secondary circuit controls the front axle brakes. The dual foot valve operates both circuits simultaneously when the driver steps on the brake pedal. This ensures that even if one part of the dual air system fails, the other circuit will continue to function independently, thereby maintaining the vehicle’s braking ability.

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This is the same video bindex have.....

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No its a foot valve