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This StopTech replacement piston is a 36mm service part for the ST-40 caliper. It’s supplied to restore correct bore sealing and piston movement during a caliper rebuild, matching the ST-40 piston diameter. Fitment with corresponding seals and hardware in a rebuild kit ensures the caliper returns to proper braking function when serviced.
StopTech Replacement Piston 36mm for ST-40 Caliper
