Actually, it's total piston area that provides the extra clamping force. For the four piston calipers it would be total area divided by two but it is still about 15% greater than the area of the single piston design. None of that matters though when they leak like an old faucet.

I opened the leaker this evening and it is SS sleeved - so much for that. I'm going to try a new seal kit tomorrow.

Did I mention that I cannot get my distribution block to seal either? I think one of the seats is bad.

For what I have in this, I could've converted to a Wilwood or Baer system.