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And for others who've been wondering about why I've been going through so many damned clutch master cylinders... I wouldn't have a clue either. After my 3rd one, I figured it was either related to the clutch slave cylinder, or something in the CMC itself. But obviously after opening up the 3rd CMC when installing my new 4th one, I noticed nothing unusual, except for remnants of silicone lubricant (which they place on the CMC from the factory).
In the past, when my clutch pedal would randomly die, I would check the clutch fluid reservoir, to see that there was barely any bore travel (can see lots of fluid moving in reservoir). Having a remote clutch fluid reservoir (Tick Pontiac GTO kit) seriously helps in diagnosing these issues, since you would probably not see any of this happening (significantly), if still hooked up to the factory brake master cylinder fluid reservoir.
I typically also cycle in new clutch/brake fluid every 4-6 months, even when my fluid isn't super dark (just a bit dark from gradual use/heat). When my brand new clutch master cylinder was starting to die like almost twice, I realized it was odd, and this just confirms my suspicions... God, I really hate the nature of these manual transmissions and am almost wishing I got the automatic version (for a daily driver).
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