Have you tried adjusting the valve? You disconnect the slave cylinder, the piston end. Then take the cap off the end of the valve body and there is an adjustment screw to center the valve. Start the engine and turn the adjusting screw till the slave cylinder piston moves, then turn the adjusting screw the other way until the slave pistion moves the other way, and you want to have your adjusting screw in the center of where it makes the slave cylinder piston change directions.
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