'68 W114 - clutch losing fluid underneath - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 12-20-2011, 08:45 PM Thread Starter
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Date registered: Sep 2011
Vehicle: 1968 Mercedes Benz 250S
Location: Winston-Salem, NC
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'68 W114 - clutch losing fluid underneath

After my DD cooked the head gasket last week, I began driving the '68 W114.
I have been dealing with an intermittent issue since summer. Every now & then, the clutch pedal goes to the floor (when pressed) and will not return. On a few occasions, I have noticed a trail of fluid from underneath the car (once in front of my home, the other today near a friend's home where I could see I'd left a trail again). As you can guess. this is

It happened again today at a very busy cloverleaf on a section of I-40 that runs through town. I was able to see that fluid appeared to be leaking underneath (when standing at the driver's head light with the hood up, looking down at an angle toward the transmission) after the clutch pedal was depressed and did not return. I checked the reservoir, noted that it was dreadfully low after filling it up this morning, and refilled it. I could still see fluid leaking, but being that I was at a busy exchange during lunch time, I didn't lie down on the road side to attempt a better view. That's a scary section of road to be standing on during lunchtime, much less lying on your side & completely unable to move in the event of an emergency.

It almost looked to be the clutch slave cylinder, so I pulled the car onto the ramps once I'd limped it home from work. The only real residue underneath the transmission was red in hue, so I'm assuming that was from the transmission itself. I can't make out any definite leakage from the clutch slave cylinder.

So far, the only suspects I can figure would be either the clutch slave cylinder OR a 4-5 inch piece of hose that may be faulty. I hit the undercarriage with brake cleaner, wiped it down and shut down for the night.

I'm truly at a loss. Anyone deal with this before? I could use some advice.

Last edited by loveofjazz; 12-20-2011 at 08:49 PM.
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post #2 of 3 (permalink) Old 12-21-2011, 02:46 PM
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Date registered: Dec 2003
Vehicle: 1965 220S, 1999 Volvo V70 (wagon), 2006 Ford Crown Vic Police Interceptor, 72 350SL 4 Speed
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Check the hose from the slave to the chassis. Also, look at the slave cyl as it may be leaking past the inner seal. Call the classic center for parts.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #3 of 3 (permalink) Old 12-27-2011, 12:28 PM
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The slave cylinder is relative easy to replace, you might replace the master too while you have everything drained - how many miles / years are on them after all?

But clearly you have to repair this before you drive it anywhere. An afternoon, some quality rebuilt parts, a few cans of brake fluid and some luck.

Frank Flynn. Poet, Artist & Mystic
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