Quote Originally Posted by ceh383
The larger reservoir for discs has nothing to do with brake bias or stopping force required. Disc brakes require more volume than drums, and as the brake linings wear the pistons are pushed out of the calipers farther and farther so more fluid is required. Next time you need to change front pads check the fluid level in the master before you squeeze the piston back into the caliper, it gets pretty low

I think that's really what I said!!
Bias = the fact that there is additional wear on the front DUE to that difference in braking effort = the additional reservoir capacity needed to keep that fluid chamber and lines full. This is true regardless of whether you have drum or disk brakes