Mine Croaked
The cheap plastic lines broke on mine and it leaked on the shop floor. The other indicator before failure was difficulty shifting. I was sure something was up when the clutch did not dissengage fully. When backing up, I depressed the clutch pedal to coast and it just felt like it was still hooked up and not releasing all the way. There is no adjustment on the slave itself, dirty or contaminated fluid will create the same symptoms.
Hope this helps.