Quote
If you go to larger tires you will notice a marked decrease in braking ability. A larger bore MC will indeed help.


NO IT WON'T!!!

A larger master cylinder will DECREASE the amount of brake pressure your foot can apply to your wheels.

It will make the pedal feel more firm, but you will lose leverage/pressure/power. Read up here to get a better idea of what changing the master/caliper ratio will do:

http://home.4x4wire.com/erik/4runner/brakes/#basics

'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik