i want to upgrade my mechanical disc brakes to hydraulics. I do a mix of all types of cycling - road, woods, parks etc. Ive got a budget of around £100 to spend on a set. Having completed a search on this forum, it seems there is a common problem with the Avid brakes. which is a shame as i saw a set of avid juicy 3's on ebay for just under £100. does anyone have any recommendations on which makes i should look at? also, what is the difference between an open and closed system?