That brake caliper is loose, the brake cable housing is pushing it off center. Apply the brake lever, and at the same time tighten the brake nut on the back of the fork. It's probably recessed and will need a 5mm allen wrench. Check centering by applying the brake slowly and see if the pads cause the rim(you're looking at the tire at this point) to go slightly off center. If this happens, grab the brake caliper and adjust it slightly. Done.