My original post didn't have enough information, I guess........here's kind of a flesh-out!
My rear brake seized today on my Honda ST1300; and I had to crack open a bleed nipple to get the pads off the disc.... I nursed it home then, and had seemingly normal front brakes. Safe at home, I'd pump the front lever and everything was okay, the rear caliper would not stick, but if I so much as touched the rear pedal, the rear caliper would clamp tight, and I'd have to crack the bleed nipple again, and pry the pads away from the disc...... and when I would crack the nipple, the brake fluid pulsed out like an arterial wound!
Two years and 17,000 miles ago, I put on a brand new secondary master cylinder, built myself a home-made vacuum bleeder (see pic), bought a shop manual, found an illustrated guide (on here, I think) and bled the brakes as carefully and as well as my wife and I could. I live in a small town, and the dealer is a mountain range and 115 miles away, and so we do our own work. And everything was fine with the brakes, until today.....the rear disc would sometimes feel warm during the "okay" time, but never overly so. If anything ever causes me to sell the ST, it will be this issue. I'd still like to delink the brakes somehow, with plugs and custom lines, and go back to front lever/front, and rear pedal/rear. Damn engineers are too clever for their own good.......
How should I start with this problem? Clean and maybe rebuild the rear m/c? Redo the whole system again, with a new SMC (my second in 36K miles)? I don't mean to be a crybaby; I love this bike, except for this issue....