Reason I asked Ron was that I recently re-plumbed the rear of my car and the rear braking improved. I also opened the proportioning valve wide open but that did not do as much as the plumbing.

I wonder if changing line sizes into the rear "T" can gain us some hydraulic advantage. IE larger diameter line into the t than what is normally run to the wheel cylinders. Of course, that means new plumbing all the way from the master back to the T. Hmmmmm?