I have a brake fluid leak between the master cylinder and the power booster. Is there a seal between the two I can replace or do I have to replace the master cylinder?
replace the master cylinder. but also check for excessive fluid inside the booster. if it's just a little inside there, you should be ok. if there's a lot, it could cause rusting and sticking.
Shops tell me that you can wash the brake fluid out with a hose and then pull a vacuum to boil off the water. I never did that but that is what they say.