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  #1  
Old 05-24-2013, 04:16 PM
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Location: St. Louis
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W114 250c: Diagnose failed clutch master vs slave cylinder?

My 1970 250c is exhibiting systems of hydraulic clutch actuation failure. Basically an erratic clutch engagement point that gets higher the more I pump the clutch pedal, and lower the less I use it. I'm guessing either (or maybe both!) the clutch master cylinder or slave cylinder has failed, but I'm wondering if there any way to know without simply throwing parts at it. Additionally, if there are any tips on the R&R of these components, I'd love to hear them.

Thanks
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Own:
1970 Mercedes 250c, 1976 International Scout II, 1982 Mercedes 240d, 1997 Honda Accord Wagon, 1998 Acura Integra Type-R, 2009 Mazda5.
Owned:
1974 International 100 pickup, 1975 International Scout II, 1981 Mercedes 240d, 1985 Mercedes 300SD, 1988 Honda Accord, 1988 Ford Thunderbird, 1991 Honda Accord, 1996 Geo Metro, 1996 Ford F150, 1996 Dodge Grand Caravan, 1997 Honda Accord, 2003 Acura TL-S, 2003 Yamaha V-star.
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Old 05-25-2013, 12:45 AM
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Location: Honolulu, HI
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I have a vehicle whose clutch slave fails every three years or so, with regularity.

Virtually every time, early on, I found that after changing the slave, the master would start weeping fluid down the pedal, or right on to my shoe.

Now I change them at the same time.

I also change the flex hose at the slave...
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Old 06-01-2013, 03:04 AM
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Quote:
Originally Posted by jeffr0000 View Post
My 1970 250c is exhibiting systems of hydraulic clutch actuation failure. Basically an erratic clutch engagement point that gets higher the more I pump the clutch pedal, and lower the less I use it. I'm guessing either (or maybe both!) the clutch master cylinder or slave cylinder has failed, but I'm wondering if there any way to know without simply throwing parts at it. Additionally, if there are any tips on the R&R of these components, I'd love to hear them.

Thanks
Is your transmission a 4 speed? Do you happen to know its ID number?
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