screwylouie
Active Member
Has anyone had any trouble with what seems like a weak spring in the front brake master cylinder? I noticed one night that my brake light was staying bright like I was still touching the lever but I was not. Upon closer inspection I saw that the master cylinder piston was taking a very long time to push the lever back far enough to turn off the brake light switch. The brakes otherwise work great and yes, the relief ports in the master cylinder are not blocked. I took the bike back to the dealer and in detail told him where the problem was. It was also very obvious when I shone a light at the master cylinder piston cap that it was moving VERY slowly. The service manager didn't listen to a word I said and must have been daydreaming when I showed him the piston cap because when I picked the bike up, they merely lubed the brake lever pivot. It was having the same problem on the way home. So, I bought the repair kit and replaced all of the internal parts myself, bled the brakes, and voila! Problem solved!.............. For a while:newsmile08:. I now think that the bore depth in the master cylinder was machined a bit too deep, bore diameter is slightly too small, or both. I checked the free length of 3 different springs and they all are within a few thousandths of an inch in length. This weekend I am going to install a spacer that I made at work out of stainless steel to replace the original. My new one is .125 thicker and so will provide .125 more return pressure(the pressure it takes to compress the spring .125) to my brake lever. I'm betting it will work like a charm but now for my question (finally right?). I don't want to buy another rebuild kit just to get the little packet of "lube" that supposedly must be used. Any one see this stuff? Looks like liquid graphite or something and it immediately turns the new brake fluid dirty looking. The instructions say to coat all rubber piston components and piston bore with this crap. Didn't do much to solve my problem last time so I'd like to skip it and save the cost of a kit just to get the mystery lube. Of course, they don't sell the mystery lube by itself. OPINIONS??:newsmile093: