Seems I have a rare situation that no one can find the cause. Low brake pedal in a 98 M3. Has 4 new rotors, rebuilt front calipers, all new pads, replaced the master, replaced the ABS hydro unit with a different used one. The only help has been the ABS replacement now offers a more progressive pedal feel, but still ends up below the accelerator pedal height. The brakes work well enough, but you'll never roll your foot for a rev matched down shift. Surely this can't be "normal" pedal in an M3 as some have suggested to me. I guess we'll go after the vacuum boost next, if no one has any other ideas.