Hard pedal

To the OP, if you have the calipers with the black "plastic" pistons, they commonly seize and need replacement, with metal pistoned calipers..

I don't know what you did to ruin the M/C, but the usual manner of removing the seat was to screw an appropriate self tapping screw, (supplied in the M/C overhaul kit, along with 2 new residual valves and new seats), then use a suitable plier, I like the sidecutter, to grasp/pry the screw/seat outta the bore..

I've successfully used 15/16 bore M/C's on everything including 4 piston fr. calipers. I believe if AJ does the math, you'll find that a poorly adjusted 4 wheel, wheel cylinder brake system would use more VOLUME of fluid than it takes to apply all the caliper pistons less than a coupla thou.

Whata ya think AJ, I know you like numbers.. lol

cheers, oh, say 7/8 wheel cyls moving 1/4 inch total..?