cobbled brake system

Thanks, I wondered about transfer of fluid being the issue and understand how the master would allow it if it were defective. It does have hard pedal, stops ok, will lock up fronts anyway then maybe 10-15 seconds it mushes to the bottom.
I think I will put it up on stands next weekend and tear it down. I will post pics. The rear is lowered with 3 " blocks and has what looks like SS springs. 7 leaves. Guess he didn't like the classic stance. It has a sway bar on the rear as well. I doubt there is any axle float, but will look. I really haven't a clue how its put together yet. lol
What master would give me best response with easy pedal and be made for disc/disc power system?