Master Cylinder black residue help Options

[Soulend]

Hey everyone,

so in the past... I want to say year, I have gone through '4' master cylinders. the first one was the original(from 97), and I replaced it because it felt like it had a really short throw and was leaking. I replaced it with a cheapo one thinking I would wait till I could get a legit complete Toyota one. then that one started getting this black residue in the reservoir and then completely went within 6 months. so in the mean time I slapped the old one back in and it felt fine. now during this point I have had put in an E153 with a 3sgte ACT heavy duty Pressure plate and a single plate street clutch. so anyway the original one started to develop the same issue with black gunk show up, though this one being old only lasted a few months and I had to rush and get something quick and that was in town...on a Sunday. This one I don't even think lasted a month before I could feel it start to go and it ALSO started with the black crap in the reservoir. the cheap masters blew through their seals. they were just ripped and missing chunks. so I figured this one the gunk in the reservoir. the original one gracefully lost its seal and you can see the wear around it. at this point I had enough time to plan and order a Toyota rebuild for the original.

I could feel a complete difference from the others and the throw was nice. However, having dealt with all of these clutch problems, I sometimes start feeling things that might not even be there. so today I went and checked the master cylinder to see if there was crap in it. and sure enough there was gunk in it.

now I didn't really know how or if I should have cleaned out clutch lines, but I did try to push all of the old fluid out with a little air pressure and clean dot3.

so my questions are
what are the chances its just crap from the lines?
should I be worried?
am I using the right fluid? (Prestone high temp synthetic DOT3 brake fluid)
is the gunk going to cause problems for the seals in the master?
is my clutch causing me to go through masters?

Thanks I have a feeling that I am just so used to the peddle that I am not really able to feel the clutch catch point in the peddle and I am just making things up.

its crap like this that makes me lose interest in cars. I haven't been to a meet almost all year, and I was going to go wash my car today and wax it to go hang out tonight but seeing this just ruined the whole idea of going out.

again Thanks for the potential help,
Kevin

[enderswift]

Oh yea, I should probably mention that I once had a crappy autozone slavecylinder that caused the fluid to turn grey. It turned out that the bore wasn't machined properly and the piston was actually sanding itself down leading to grey fluid. But that doesn't sound like what you have at the moment.