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Thread: c6 clutch

  1. #1
    krh
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    Default c6 clutch

    i have a 2005 conv today going from 1st then 2nd little faster than normal for me, showing off. the clutch went to the floorboard and would not return, lucky i was close to buddy of mines shop, cannot find cause , we had just put a performance program in it, could that be it, my friend thinks it is master cylinder. help please. krh

  2. #2
    Tuna's Avatar
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    My 08 did that a couple of years ago. The dealership had to replace the master and slave cylinder, all the fluid and the clutch as it put fluid on the clutch plate. The performance program has nothing to do with it.
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  3. #3
    Technical Writer for Internet & Print Media
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    "Tuna" is correct. Your clutch problem is unrelated to any reflash of the ECM you did.

    The problem is either the clutch itself, or more likely, as "Tuna" suggested, a problem with the clutch hydraulics. I had the same problem with my 04 and it was a faulty clutch master cylinder so I'd check that first.

    If the concentric clutch slave is leaking, don't wait to long to fix it or you'll be buying a clutch, too.

    Sadly, the labor on a C5/C6 slave is expensive because the torque tube and transaxle have to be removed to service clutch hardware.

  4. #4
    krh
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    Default c6 clutch

    thanks guys, my buddy runs shop never worked on newer vetts but he said same thing not related to program, but it happen when testing after prigram installed, he said master cyl fluid was horribl back gooey, started blleding clutch got clutch back for a second then gone, master cyl coming hope thats it, any more suggestions. thanks krh

  5. #5
    Tuna's Avatar
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    The gooey, black fluid appeared to have gummed up the slave cylinder on my car also and it was leaking, which is why the dealer replaced it too. Since mine was under warranty, the dealer replaced everything. Been good since.
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  6. #6
    krh
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    Default c6 clutch

    thanks tuna, vette fixed yesterday master cyl doing good now, bet i dont overlook changing clutch fluid anymore, all gooed up. thanks for help. krh

  7. #7
    krh
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    Default c6 clutch

    thanks hib, you dead on master cyl was problem good now, will change fliud more often. again thanks krh

  8. #8
    Tuna's Avatar
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    Glad to hear it.
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  9. #9
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    Quote Originally Posted by krh View Post
    thanks hib, you dead on master cyl was problem good now, will change fliud more often. again thanks krh
    Did you just change the master and add new fluid or did you "change" the fluid by bleeding the clutch slave per the Service Manual?

  10. #10
    krh
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    hi hib, bleed old out new master came with fluid in it . when working on it he kept bleeding and adding new then got new master in and it came with new in it. clutch back way it was, going to change out fluid more often now. thanks again krh

  11. #11
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    The above is difficult to understand and didn't really answer my question.

    So, here's the 411 on bleeding.

    To properly flush and bleed the clutch hydraulics, you need to remove the exhaust, remove the torque tube tunnel close-out panel, then bleed the clutch slave per the Service Manual.

    If you don't do it that way, you've not bled the system and the contaminants in the fluid (that black goo) will eventually cause the new master to fail.

    Good luck.

  12. #12
    krh
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    Default c6 clutch

    hi hib. sorry for the confusion on my explanation we did exactly as you discribed, put it on lift exhaust off other things you stated bleed all old out. fluid clear master in works great. thanks again krh

  13. #13
    Technical Advisor c4c5specialist's Avatar
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    Hi there,

    GM service recommendation is 2 years / 24000 miles for all c5 and c6 clutch fluid.

    88958860 or DOT 4 brake fluid should be used.

    The issue is HEAT and the fluid boiling when under stress. Thats why header equipped cars have MORE issues as the headers are RIGHT next to the hydraulic lines and need heat insulation.

    You most likely repaired your condition by bleeding the system.

    All GM masters and slaves already come with the fluid in them, as you have stated.

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  14. #14
    Dad
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    Where does the 2 year/24,000 mile service recommendation come from, it's not in my owners manual nor is it in the service manual GMP/05-Y-1 or 2?

    C6 has been to 20 states, 49K miles and counting... slowly, more fun driving the '64 and the '72.

  15. #15
    krh
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    Default c6 clutch

    hi dad, i hope you are not asking me cause i dont know about frequincy of changing fluid in clutch, never seen it stated how often , but since i had problems it will be changed more often than every 2 years i am sure. thanks krh

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