The same thing happened to me and I tightened the bolts thinking it would do
the trick but the problem was a leaking clutch master cylinder, it was plain
worn-out.  I ordered a new one from Van-Again and put it in with no problem
thanks to the fine instructions found in the archives.  This is an easy do-it
yourself job and I encourage you to do it right away.  I put it off and the
brake fluid ate away at the paint under the carpet and created quite a mess.
Good Luck!
Loretta
87 Syncro GL
90 GL
82 Westy "project"