I have a 1980 Honda Prelude and have only driven it a few hundred miles per year for the 10 years I've owned it. Redid the clutch when I got it, with new cylinders and everything.
Last week I got in it having not driven the car for several months, and the clutch was just dead. No hydraulic pressure at all. Two days ago I bled the line and put in new fluid. It was working again although the pedal still was only coming up half-way.
Today I was driving and with my foot, I pulled the pedal all the way up. Then when I pushed it back down, no pressure again -- somehow air got in the line from me lifting up the pedal all the way like that.
I looked at the master cylinder and it has yellowish residue on it. Is that a sign that it's got a leak? There is also what looks like red mold or rust on the shafts of the pedals, since the car has been leaking moisture into the interior (I live in a city where it rains a lot).
My question is, firstly, what would cause the clutch hydraulics to leak and get air inside if the car wasn't even being driven? I probably didn't add clutch fluid in several years so I'm assuming it just evaporates slowly over time, but my brakes haven't had the same problem so I wonder if it's something else.
What could cause the master clutch cylinder to leak after not many miles? Defect? Maybe from freezing repeatedly over several winters?
I'm just wondering if it's worth bleeding again or if I'm likely to run into the same issue.