Join Date: Sep 2011
Location: Los Angeles, California
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It is normal for the brake pads to rub a little more than usual against the disc rotors after you disassemble and reassemble the calipers. I did the same thing a couple months ago, and was initially worried about the rubbing because I had no idea what it was at the time.
Before bolting your calipers back onto the wheel, make sure you widen up the pistons as much as you can. Use maybe with a screwdriver wrapped in cloth (so you don't damage the pistons) and wiggle it back and forth or with your hands to open them up, and put it back in as quickly as possible.
The pistons will slowly relax and start to close, which will cause some rubbing. Once you start riding around a bit, the brake pads will initially wear a bit more than normal but the rubbing will go away fairly quickly.