On cars that don't get driven often that have cast iron rear wheel cylinders, its pretty common to see them rust, leak, and fail. I see there are places that will sleeve your OE wheel cylinder with brass or stainless and warranty them for life ($89 each).
Is anyone aware of wheel cylinders being sold already sleeved or in a aluminum, brass, or stainless material? My 1969 Firebird rear wheel cylinders are about as common as they come. They are used by GM for 20 plus years in almost everything. They are cheap to buy new, only about 10 bucks each in iron. But they rust fast if not driven much. Has anyone seen any better replacements?