Backing them off won't work. You may have a caliper starting to seize up. If you back them off, then the next heat cycle they will be right back where they were. Pop the caliper off and look for corrosion or anything that may have built up around the caliper pistons. But for the love of God, don't hit the brakes with the caliper off. The pistons will shoot right out if you do.
Also inspect the brake pads. It sounds like they may be contaminated with grease or some other fluid. Personally, I'd change the pads while the calipers of. It's a cheap way to ensure they aren't the problem.