Rear brakes on my '01 ST4 are weaker than most Ducs, getting worse. Rotor, pads, fluid OK. Insufficient pressure. Front brakes oustanding. 5500 easy miles on bike. Any suggestions as to where I should start looking for something not right? The ST2/ST4 bible does not address the problem at the wrenching level, at least not my book. Thanks, Andy in Seabrook, TX