1995 Chevy Blazer Rear drum leaking

I recently bought a 95 blazer from a friend of mine knowing it needed minor repaires. Only repaires made to the braking system was replacing the abs unit. After replacment it worked great but noticed an excessive amount of fluid leaking just after parking it. Looked around and found that the passenger side rear drum brake was leaking fluid. Only a few drops at a time when sitting but apparently a good amount just after stopping. Any Help!??????????