My series 1 Grimeca disk on the rear will gradually adjust itself tighter over the course of several hours of use. Eventually, I'll have to relieve the pressure by opening the bleeder, then squeezing the lever to let some fluid out. This seems to happen more often after hard, downhill use when the brakes get hot. I'm used to doing this every couple of rides or so, always in the middle of the woods, but everytime I do this I obviously lose fluid from the system. I've flushed and bled the system several times without correcting this problem. The front brakes have never done this. Any ideas as to what to do to stop this??
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