2009 ER6n very light rub on the rear brake?
The other day, I stopped to put some air in the tires and noticed that my rear brake rotor was decently hot despite not riding hard. The front rotor was merely warm. I rolled the bike around, didn't feel any drag, so I rode the couple of miles home without using the rear brake. When I got there, the rotor was still warm but not anywhere near hot. The bike hasn't given me any signs of drag from the wheels outside of that day when I noticed I wasn't free-rolling down a hill quite as quickly as I would have thought. I can roll it around a parking lot easier than my last bike, and I was lucky if the rear brake even worked on that thing... Since then, I've noticed the same symptom: No signs of drag, just a little warmth on the rotor, though not as hot as that day.
So it's as if it's merely touching the rotor, but not dragging. Unfortunately I don't have any way to lift the rear wheel and spin the tire. More than likely, it seems like maybe the pedal is adjusted incorrectly and is slightly active when riding. Still getting close to 50 mpg on every tank though, and I've never smelled burning brakes.
What do you guys think? Anything I should test or inspect? I've checked rotor wear, brake lines, etc, and all looks well. I also just put these pads on when I got the bike maybe 2000 miles ago. Perhaps I forgot to adjust something? My last bike was from the early '80s and had an old spring-loaded boot for a brake, so hydraulic discs on bikes are new to me. Wouldn't doubt I just missed something.