My friend has a manual transmission 2000 Honda 1.6L iSR whose clutch peddle pops down at the slightest touch and doesn't return to the up position unless you pull it up.
The clutch system is hydraulic and looks like this:
The clutch system uses brake fluid ( DOT 3/4 ) and the reservoir is fullish, and the fluid has clearly not been changed probably ever. When checking under the dash I could see a drop of oil hanging from the rubber seal where the push rod goes into the master cylinder.
My suspicion is that the internal seals on the master cylinder are shot and that he'll have to replace it or have it rebuilt. I was thinking also there maybe air in the system, but then there would still be some pressure and it would just be mushy like brakes get I would think.
He had this problem once before he told me and said it had "worked itself out" the previous time.
Does that sound like a correct diagnosis, and are there any temporary measure I might be able to take to get car to the garage, or is he just better off having it towed?
However, if it does sound like air in the system, could that be because it wasn't properly bled after the clutch was replaced a few months ago?