My fluid diapppears till I get a soft pedal a few months later after being full. Has anyone found it leaked into the booster in the back end of the cylinder? I could just add fluid every few months, 1/2 cup or so, but I need a real fix. I can't find evidence of any obvious leaks elsewhere. Also, sometimes when cold I get a trail of bluish smoke on my first long down hill. It looks like a PITA to change the master, so I have been putting it off. Also, is there a test positive for this leak issue?