Ran 2 proportioning valves because I had them. Initially all I had was a stock one, no worka so good, so I bought a willwood and installed it. Since then, I removed the semi stock one and just left the willwood because it didn't make any difference in braking. This was a conversion on a 55 , I was asking on this board hoping for a little knowledge since most of the parts are from the toy pickups. The rears are currently monte carlos. When I had stock drums in the rear, the pedal feeling and lockup wasn't any different. There are not any residual valves installed. I just assumed that the fzj80 master cylinder kept the 2lb residual pressure on the lines. Is this my problemo? The pads already seem to stay butt against the rotors, front and rear. I also have a mc off a 93 v6 4runner that I tried, also, no difference.
Why was I looking at smaller piston? It seems like the bulk of the problem is not enough fluid pushing the fronts(currently have the giant v6 calipers). Smaller pistons will be forced a little harder, creating a better balance with a larger rotor. Larger is not always better for a caliper and often result in imbalance of modified systems when people try to find the biggest caliper possible.
I've replaced hard lines, so blockage isn't an issue. I've also replaced soft lines, so bulging or collapsed lines are also not an issue. With each of these, it was tested before and after. Also have bled the living bejezus out of the brakes.
