Originally Posted by matt2491
Thanks for all the info guys. Here's what I'm going to do: Use a 1968 Mustang disc/drum 1" bore master cylinder and add a 10# rpv and a Wilwood proportioning valve to the rear circuit. That outta cover my brake system. That will let me avoid the combination valve.
I would use a 68 drum/drum mc w/ internal rpv's; remove rpv from front disc mc port.
If new drum/drum mc does not have rpv you can rob one from your old mc.
a1 cardone no longer includes rpv in the cheap mc.
The drum/drum mc will fit (68 mustang). the disc/drum mc will not fit (68 mustang) w/o adapter.