[pooreds]

Well, I want SPF to spend their money to figure this out. When I ordered the car, it was advertised as having Wilwood 4 piston on all four corners. So, I thought the 427r would be fine. Then they told me I needed at least 10 inches of vacuum operate. I got that. Then they told me I needed different front pads. It helped. Now I need a vacuum pump? whoa... they also told me I was the "only" car with PBR'S that had a problem. holy cow when does it stop. SOOO I did some hydraulic math, I sell hydraulics for a living!
With 800 psi pedal pressure, this is what you get with the piston sizes!

41mm float style single piston= 1632 lbs force (PBR)
41mm dual piston = 3264 lbs force
Four Piston Wilwood, smallest size avail, Dynalite 1.375" piston = 4768 lbs force. Pretty big difference, almost three times the force.

Now you know why I'm *****in as much a wannab5150.
Thanks for your post! now there are two of us, I hope more will join. ED