I'd like to know as well. I installed a new MC on my 91SL and even after several bleedings with a positive pressure bleeder, I still have what I feel is excessive pedal travel before the front brakes begin to grab. I thought that the large piston / cylinder toward the rear of the MC was for the front brakes. I have no air bubbles, and my brakes work marginally OK, but I have to push on the pedal almost halfway before there is any resistance. I know this isn't right, but I can't find any cause for it either. Does the ABS box need some special attention when bleeding? What effect does the vacuum booster have on the pedal travel? I'd surely feel better if the pedal was firm right at the top.

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