Air Brake Relay Valve on Volvo Truck FM 440 – Air Braking System



Air Brake Relay Valve on Volvo Truck FM 440 – Air Braking System. How It Works ??

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In this video, I will explain one component of the Air Brake System on Volvo FM 440, the Relay Valve.

On Volvo FM 440, the Relay Valve is used for “Relay Valve Parking Circuit” and “Relay Valve Front Circuit”.
So both components are used the same.

On this Relay Valve there is a sign (code number) on each hole.

1 = Input (Supply) of air from the Parking Tank

2 = Output (Delivery) of air to the Brake Chamber on the Parking side

3 = Evacuation (Drain)

4 = Air signal from “Hand Parking Brake”

For more details, see the video until the end ..

May be useful..

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