Help - Brake Problem

[Bigblue73]

I finally got my wifes Cuda running the other night, I took it out on the road and noticed nothing, everything was fine. I popped the hood and found brake fluid dripping from the master cylinder cover. I pulled another master cylinder cover off of my Challenger and same thing. The master cylinder never did this before. Problem? Any Ideas?

The brakes are the stock power disc brakes that have been gone thru prior to all this swapping. Any ideas? I'm sick cause it trashed the paint on the inner fender. The car has headers - but the header are pretty far away from the master cylinder, at least 8 - 10 inches.

Thanks, for any advise.