My yukon came with mx-4 cable discs. I honestly don't have much complaining except it doesn't bite predictably. Also the bite fades sometimes. Otherwise for mild riding, or city riding its fine. I notice my pads are starting to wear out a lot and rather then getting new pads I was thinking about getting hydro brakes. On ebay I can get a pre bled shimano xt m775 kit minus the discs. Can I use my mx-4 6" discs with this ? Also for a little more I can get from a local bike shop juicy 7's that do come with discs. Should I go with an upgrade? which upgrade ?