the sign to rebuild was obvious for me, though. i had fluid drips from where (oh i forgot exactly what's it's called) the dust seal that covered the push rod that entered the engine block. anyways, dude, i rebuilt the slave and it really is easy. according to the maintenance schedule, the seals and o-rings for the master were due as well, so i did them, too. matter of fact, i rebuilt the front and rear brake master and slaves since i was at it. it seriously, isn't that big of a deal--not like a starter clutch fix hehehehe ugh. put it this way, i just started riding bikes last october, the most mechanical thing i've ever done was change out the brake pads for my cages. if a computer geek like myself can do it, so can you.