Rear brake problem?

[Owlie]

Remind me again....what kind of bike do you have? Road or hybrid or something else?

If they're road calipers, you can just manually rotate the calipers until they're centered. You may have to re-adjust the brake pads so that they hit the rim and not the tire after re-centering it. Always check that the wheel is properly centered in the drop outs and it's reasonably true before making too many other adjustments.

If they're either linear pull brakes (v-brakes) or cantilevers, it's a little more complicated, but not difficult.

It's a road bike. Wheel appears to be centered. I've tried manually rotating the calipers on BF's advice, but they rotate right back.