Sorry I,m not real good at explaining these things. These old brake cyls. get cruddy over time. The fluid breaks down & moisture eats into the cylinders. when you replace parts you move the internal rubber parts over the cruddy area. If the cyls. didn,t leak before they will soon. Anytime you replace brake shoes you should o,haul or replace the wheel cyls. Late model vehicles or old ones. Any time I get a new old vehicle The first thing I do as far as brakes go is rebuild the master cylinder.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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