I'm about to install speed bleeders on my 87 Coupe. The brake fluid is a nasty shade of dark brown so I am going to flush it all out and put in DOT 4 fluid. A friend of mine suggested that I buy a couple jars of alcohol and after getting the old fluid out, put alcohol in the reservoir and flush the system with alcohol before adding the DOT 4 fluid. He claims the system will be a lot cleaner. Anyone done that? Is it safe for the system. I already had brake failure due to fluid contamination and want a clean system before adding the DOT 4.