Quote Originally Posted by Overkill View Post
The vacuum will increase the psi at each wheel cylinder considerably and the hydro boost will increase the psi at each cylinder by more than a thousand psi over the vacuum booster. That's why the pedal pressure is so much easier.
Could you tell me a little more about the Ford cylinders and the Chevy shoes? What vehicles are they from? Do you have to do any modifications for the swap?
Are you running the stock size tires? Thanks a lot for your input.
I'm not trying to start an argument I'm trying to learn. How does a hydo boost increase the pressure in the brake line? My master cylinder still functions the same way while it is bolted to the hydro booster as it would if it were bolted to the firewall. By my thinking the only thing the booster is doing is multiplying the torque I apply to the brake pedal and transferring that to the master cylinder. The master cylinder is pushing the fluid to the brake cylinders in both cases. The only thing I can think of is maybe I can't physically push the pedal hard enough by human strength to create the same pressure?

The modifications I did are mods that are documented here on the zone.

Ford cylinder swap here:
http://www.m715zone.com/vb/showthread.php?t=9577

Chevy shoes mod here:
http://www.m715zone.com/vb/showthread.php?t=15990