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Back a while ago clutch started slipping because seemingly too much pressure was building up in the line. I then proceeded to rebuild the slave cyl., but nothing changed.
Just this week I decided to rebuild the master cyl. I have been swapping old and new parts in the master with various results, but no working clutch.
I think the original problem, was a totally plugged compensation port. I managed to clean that out, but now I'm having the opposite problem from before. I can move fluid through the system and out the slave bleeder, but I can't seem to generate sufficient pressure to actually move the clutch. Pressure out of the master seems good, when I fill with fluid off the bike, I can generate some good squirting straight out of where the banjo port is.
It's a pretty simple system but I can't figure out what the problem is. Should I pull the slave off (again) to have a look?
Have you tried pushing fluid from the slave to the master.
No I haven't. Seems like that would be hard to do, but I suppose I could hook up some compressed air and push it through the slave bleeder?
WIth the line disconnected at the slave, I put the slave banjo in my mouth and blew, to check for restrictions. I did get some air bubbles coming out the master when I did that.
I just bought a new/used line, and will swap that out as soon as I get it. I doubt that will fix the problem, but it's a cheap experiment.
No I haven't. Seems like that would be hard to do, but I suppose I could hook up some compressed air and push it through the slave bleeder?
WIth the line disconnected at the slave, I put the slave banjo in my mouth and blew, to check for restrictions. I did get some air bubbles coming out the master when I did that.
I just bought a new/used line, and will swap that out as soon as I get it. I doubt that will fix the problem, but it's a cheap experiment.
How does brake fluid taste?
Don't use compressed air, you don't want to introduce more air into the system. Seems I recall someone using a very large syringe, or something similar. I have used a Mityvac to pull from the slave.
Get an really good HD syringe and reverse bleed, from the slave up. When systems get finicky, this method works great. Happens more frequently when lines become completely drained too.
Well I got the new/used line and swapped that out. Then went about bleeding the same normal way from the master. It took a little while but I eventually got good pressure and clutch engagement is back to normal. Next step is a test ride to see if it still slips under hard accel. If it does, then I'll have to put a new set of discs in.
So did about 60 miles yesterday, and clutch didn't slip at all under various combinations of gears, rpms, and throttle. Great success! Was the old line part of the problem? I don't know for sure, but at least all the hydraulics have been rebuilt now, and it cost less than $100 for all the materials. Spent many hours of my time on it though .
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