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J35Y2 · 05-02-2025, 08:01 PM

So… if my new clutch master cylinder hasn’t failed, and my clutch pedal keeps getting softer and softer after a few weeks of driving… I can only think that maybe my bone stock clutch slave cylinder might be faulty..? The CSC is the bone stock, original one from the assembly line, and I haven’t touched anything else on the hydraulic clutch system, besides the numerous failed CMC’s, and the upgraded stainless steel braided clutch line and Pontiac GTO remote clutch master cylinder fluid reservoir.

I sometimes bleed the CSC again after a few days or so of driving, after it’s “broken in” (most people probably won’t bother), just out of my paranoia and experience with my current clutch hydraulic issues… It will feel like a brand new car, with a super hard pedal, where engaging all the gears with the shifter actually feels like a brand new car. And then after driving for a few weeks, the clutch pedal gradually gets softer, and you can tell either air has gotten in, and the shifting quality has decreased, probably because the clutch isn’t disengaging 100% from the lack of full clutch hydraulic pressure…

I mentioned before how I would always bleed the clutch, have a perfectly functioning transmission, and then end up with a notchy, sloppy feeling gearbox within weeks to months of bleeding the clutch slave cylinder… At this point, I think replacing the clutch slave is the only other thing I can do, so I don’t constantly change my transmission fluid early (been seeing more metal shavings than typical manual transmission servicing).

I hate how the clutch assist spring gives the clutch pedal extra pressure, as kind of a “fake” hard clutch pedal feel. If you take the spring out, it feels like one of the most basic clutch pedals. I rigged up my own return spring since I didn’t wanna pay $90+ for the Lingenfelter one, and with what has been going on, I didn’t feel safe enough to let the clutch pedal function all by itself, with no return/assist clutch pedal spring. Even with the return spring in place now, you can press it a little and notice not actual dead pedal, but a much softer pedal and lack of hydraulic pressure, all the way through the clutch pedal’s travel.

05-02-2025, 08:01 PM	#17
J35Y2 Drives: 2010 Chevy Camaro 2SS manual coupe Join Date: Dec 2023 Location: Sacramento, Ca Posts: 84	So… if my new clutch master cylinder hasn’t failed, and my clutch pedal keeps getting softer and softer after a few weeks of driving… I can only think that maybe my bone stock clutch slave cylinder might be faulty..? The CSC is the bone stock, original one from the assembly line, and I haven’t touched anything else on the hydraulic clutch system, besides the numerous failed CMC’s, and the upgraded stainless steel braided clutch line and Pontiac GTO remote clutch master cylinder fluid reservoir. I sometimes bleed the CSC again after a few days or so of driving, after it’s “broken in” (most people probably won’t bother), just out of my paranoia and experience with my current clutch hydraulic issues… It will feel like a brand new car, with a super hard pedal, where engaging all the gears with the shifter actually feels like a brand new car. And then after driving for a few weeks, the clutch pedal gradually gets softer, and you can tell either air has gotten in, and the shifting quality has decreased, probably because the clutch isn’t disengaging 100% from the lack of full clutch hydraulic pressure… I mentioned before how I would always bleed the clutch, have a perfectly functioning transmission, and then end up with a notchy, sloppy feeling gearbox within weeks to months of bleeding the clutch slave cylinder… At this point, I think replacing the clutch slave is the only other thing I can do, so I don’t constantly change my transmission fluid early (been seeing more metal shavings than typical manual transmission servicing). I hate how the clutch assist spring gives the clutch pedal extra pressure, as kind of a “fake” hard clutch pedal feel. If you take the spring out, it feels like one of the most basic clutch pedals. I rigged up my own return spring since I didn’t wanna pay $90+ for the Lingenfelter one, and with what has been going on, I didn’t feel safe enough to let the clutch pedal function all by itself, with no return/assist clutch pedal spring. Even with the return spring in place now, you can press it a little and notice not actual dead pedal, but a much softer pedal and lack of hydraulic pressure, all the way through the clutch pedal’s travel.