1987 Acura Legend Clutch master & slave cylinders

1987 ACURA LEGEND
196,000 MILES • 6 CYL • 2WD • MANUAL
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BMAJESTIC
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I've had the clutch master cylinder replaced about 2 weeks ago because of low engage/disengage point - like right on the floor board. After install, clutch was high until after driving 5-10 miles. Then came down but not to the floor and was shiftable. When parked overnight or for a few hours, the engage/disengage point would come back up to where it was just after the cylinder install. Driving would take it back down again. I don't see any leaks and I just had the clutch lines bleed yesterday and clutch point came back up Drove and shifted for about 10-15 miles through city traffic. The point went down a little until I got on the freeway and traveled about 15 more miles and the point went right back down to the floor. It sits awhile and comes back up. Been checking the fluid level and it doesn't seem to go down at all through all this.
I had the slave cylinder replaced about 4 years ago for the same problem. Could it need another slave cylinder replacement so soon? Is this a slave problem?
Aug 15, 2009 at 5:33 PM
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MHPAUTOS
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HI there,

Thank you for the donation,

If the slave is faulty, there will be fluid under the rubber boot. The clutch hydraulic system is very basic, if there is no fluid leaking at the slave i feel that you may have a faulty new master cylinder, check this next and report back your findings.

mark (mhpautos)
Aug 16, 2009 at 4:14 AM
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BMAJESTIC
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Yeah mike, thanks for your quick answer. Unfortunately the issue seems dead in the water so to speak. I took the Acura back to the shop and suggested that they may have installed a faulty master. They put it on the rack and drove it and concluded (not in so many words) that everything "seemed to be fine". Then suggested that it might be a clutch pressure plate problem. And of course the bill would run about $600. Good way to send me out the door and never to darken it again with this particular car. Which I did. Now I'm looking for another car.
Thanks again
Aug 25, 2009 at 4:10 PM
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BMAJESTIC
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This is a follow up to my original question. I've now had both the master and slave cylinders replaced. Clutch works fine until after I drive for a while then engage/disengage point gits closer to the floor until I can't shift out of gear. If car sits for a while or over night, pedal comes back up to where I can shift.
Sep 9, 2009 at 5:34 AM
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MHPAUTOS
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Hi there,

with the hydraulics now known to be sound, there may be an underling problem with a pressure plate, this is a bit hard to diagnose with out driving as you can well imagine, get a second opinion from one or two mechanics and post there thoughts here for consideration first.

mark (mhpautos)
Sep 9, 2009 at 6:19 PM