[chrismorse]

When i was a service manager/writer at a dealership, (not porsche), i was frequently called on to supply the "leg" for pedal bleeding.

In a significant number of cases, we experienced a creeping pedal after bleeding that was not there before our work. I concluded that over the years, with normal use, and infrequent fluid flushing, that the MC seal had relatively limited travel and that any debris, rust flakes would get pushed to the end of normal travel - then with bleeding, if the debris was rough enough, the seal woulld get pushed beyond the prior distance, cutting, abrading the seal.

If you stomp the pedal and it is hard, initially, it is not likely air in the lines.

We then started using a pressure bleeder and recommending more frequent brake fluid changes to keep the MC as clean as possible. It takes time for rust and debris to develop and accumulate, so, one of the points of this is to flush every year or two - or more frequently if tracked.

If you decide to overhaul the MC, have a good look at the bore, to make sure it is pristine.

good luck,
chris