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Reply to "Distribution block rebuild"

For more information do a search for shuttle valve.

The plastic switch serves to illuminate the trouble light for the brake system should a break occur in a hydraulic line.

in theory and my experience the two black O-rings isolate that switch from any hydraulic pressure. It is purely a mechanically actuated switch

Sight through the open hole to locate/position and center the groove in the middle of the shuttle valve.

The plunger on the switch should rest in that groove. A loss of pressure on one side of the shuttle valve will cause the side still with good pressure to move the valve. The full diameter of the valve will now depress the switch plunger and illuminate the light

Larry

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