That's the same exact thing that's been happening to me 5 lug. I've refilled the brake reservoir twice already this year and it's happening again. My friend suspects that there has to be a faulty brake cylinder, where else can those fluids have gone. The first time it happened I sent it to the dealers and came back with a reason of "Low and Dirty fluid" and $141.00 for just that, OUCH. I went ahead and drained it and fill it back. A couple months later it started acting up again. So I figure it can't be dirty so my friend filled it up. And now its back to that dillemma again. Where da hell are the fluids going! I'm afraid to bring it back to the dealers. There has to be some recall with this stuff. I know that I've encounter this same problem @ superhonda.com site but no one has ever mention of any recalls. uurgh!