I'm trying to find a cupped piston seal to repair a Shimano Deore hydraulic bike brake caliper. Shimano doesn't sell repair kits so that is not a source. I've tried to find it through local auto parts stores and no luck. Got in touch with Grainger. They were close but the size was off. Spoke with another supplier of such seals and they couldn't find one of the same dimension. I'm wondering if these particular seals were specifically made for Shimano and this application. Does anyone know of a company who might source these or comparable seals? I can buy a new caliper for 30ish but would rather repair these calipers since everything other than the seal is in good condition.
