'64 Barracuda Master Cylinder.

Im stumped about this too, as there should be no fluid coming from the rear of the MC period! Must be a seal problem! I also vote for a dual res change, they're much safer! I used a dual chamber unit correct for a 69 Dart with manual disc on my 66, looks just like the original 66 disc unit!! I doubt that anyone would throw up a red flag about a conversion here, unless you're going to be concours judged!! Geof