67 mustang brakes

[johngross]

I have a 67 mustang with front disc brakes. I changed the rearend to an 8.8 with discs and now I can't get decent rear brakes. I resume the master cylinder needs to be changed. Any suggestions?

[MCB Matt]

Yes, you will need to run a proper 4 disc master to ensure proper flow. Is the front system an aftermarket kit? Do you run a prop valve too?

Also need to make sure there is no resid. Pressure valve inline to the rear or the rears will drag, they were used with rear drum to keep the shoes closer to the drums.