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Updating this again since I took apart the other CMC that kept failing (GM P/N #174-1179), and found absolutely nothing wrong whatsoever… Only thing that needing some “care”, was the shaft that moved up and down with the plunger/pedal attachment.
I guess the silicone lubricant wears off and somehow ends up making it’s way into the hydraulic system, where remnants stick inside of the CMC. Idk if that was an issue, but there was some silicone lubricant along all of the seals, except for the main o-ring that goes after the locking snap ring in the CMC.
My new Dorman CMC P/N #CM640176, pretty much acted like a brand new CMC. Like any other PROPERLY working CMC, it gained full pressure after about 5 to 10 pushes of the clutch pedal. I pumped it between 30-40 times in between each bleed, and made sure enough air got out. I was even tempted to bleed it again after the car heat cycled, but I checked the pedal and the fluid reservoir with the cap off, and it’s been amazing.
Probably still going to change out my trans fluid soon, since I feel like there’s metallic gunk in there.. Not a whole ton, but more than “normal”, since my shifting quality deteriorated as the other CMC started failing over time. 7-8/10 shifts were always notchy, and I believed it was either inferior ATF that I had filled the trans with, or that the synchronizers and blocking rings or other gearbox parts, were somehow prematurely failing (even though I’ve been babying the car the past 10k miles or so).
I guess we’ll see if I update this by Thanksgiving or Christmas time… I’ll update this as soon as possible, if the shifting quality begins to deteriorate. Normally, I do a trans fluid change and sometimes bleed the clutch, and it will start to feel crappy again within a day or week, so…
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