[mosearch]

I replaced my factory original clutch slave cylinder at 40,000 miles...I used the Beemer Boneyard European aftermarket part (looked exactly like the Magura original). Not sure if there are particularly "bad" aftermarket versions out there...or what the souce might be.
In any case, I have 60,000 miles now (20,000 with the replacement slave), with no clutch problems. It does seem to pay to flush the clutch fluid every 18 months or so.