Thank you - I searched the forums but didn't find that thread. I guess I need to check my master/booster setup.
Something I didn't mention, I replaced the rear brakes (pads and rotors) about 10 months ago. Fronts have never been touched (80k miles) and still have 45% pad left. I took it to a shop with this problem and they "couldn't find anything wrong". I already have the pads and rotors to replace the fronts, but I don't want to ruin the new rotors if this sticking continues. Sometimes I have to drive with the sticky brake and it heats up quite a bit which could warp the new rotor.