Need to repair your leaking 1979-1993 Mustang master cylinder, brake booster, or proportioning valve? If you are losing power assist in your Fox Body brake system, a faulty master cylinder or brake booster is usually the culprit. Latemodel Restoration has the direct replacement parts you need. We also carry adapter hard lines for popular brake swaps. Manually adjust the fluid pressure in your Mustang with a Ford Racing adjustable brake proportioning valve and finish it all off with a chrome master cylinder cover to give your engine bay a little more style. Don't forget your high performance brake fluid to keep your brake fluid from boiling. These parts fit 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993 Foxbody Mustangs.