Master Cylinder Mystery leak

51John said
I have a'65 Valiant with a 318, it has a aftermarket dual master cylinder, I've noticed that when I shut off the car after a cruise, the master cylinder will leak a little fluid..I noticed this because the fluid is dripping onto the exhaust manifold and burning up..The two brake lines are perfect without leaks. Somehow its coming out from beneath the rubber gasket. Could his be from the heat? Any thoughts are appreciated.

I just went through this same problem, four wheel drum MC. I bought some gasket material and cut it the size of the MC gasket hollowed out the center so the two cups can move up and down and placed it between the metal cap and gasket and the cover went on much tighter. It didn't leak so far but I haven't really tested it too long.