I'll echo David to check cable housing. Specifically where it seats in the adjuster barrel, as sometimes the housing can come out and get hung up on the ferrule. I had problems specifically with my front brake doing this at the lever. I was using non-aero levers and the housing would pop out of the seat in the lever, but I couldn't see it because of the hood. Also possible there is a small pebble lodged in between the brake arms. If you can get the tire out, squeeze the pads together like you're trying to make them touch. That should shed some light.
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