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'01-E320 & 02-ST2
31,798 Posts
When you pump it and have a firm pedal, if you simply hold pressure on the pedal, does it stay firm? Or does it slowly sink to the floor? If the latter, then it's the master cylinder. If it stays firm once pumped up while you're holding pressure on it, then you have air in the lines.

And how was the pedal before the work? If it was fine before, then that is probably your answer. ;)

Particularly since you don't sound sure of your bleeding efforts, I'd refocus my efforts there. If it doesn't improve then I'd look at the rear calipers to be sure there isn't an issue with them.

Take care and enjoy the ride,
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