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PDWA Switch Actuator 149971
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This screws into the brass body of PDWA housing and the exposed pin engages with the valley in the shuttle.
Should pressure be lost in the forward or rear braking lines the shuttle will displace pushing the pin up to make connection and the end of the shuttle will earth against the inner orifice it seals off thus switching on the Bulb in the Brake Warning light on the Dash Board..
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