Many, if not all of the GM Clutch Actuator Cylinders recently produced (past 2 years) have had the piston seal installed backwards. With the actuator piston seal installed backwards, when actuated, the seal is expanded in such a way that the piston may bind before completing a full stroke. Until this information gets back to the manufacturer and corrections are made with production and inventory, all new actuator cylinders sourced from GM and NAPA should be carefully disassembled and the seal reinstalled in the correct direction if degraded performance of the cylinder is present.
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