Moparts please help>... I cant seem to stop brake fluid from leaking from master cylinder metal lid. 69/70 superbee with 4-wheel drum brakes. I've replaced 3 master cylinders, proportioning valve, and bench bled all masters. rubber gasket isnt squished or torn. this is the bolt on style lid. only used until 1970. in 1971 the design changed to the Bail Strap style lid. no more bolt. Car drives and stops great doesnt seem to have air in it. pedal feels great. please help its ruining my new paint job and undercariage. :bawling