My front brakes were making a creaking noise like a door at a haunted house. While stopped or stopping. Guy at Valvoline nailed it when he told me one of my caliper dual pistons was binding. I pulled it apart and one piston was retracted and one was not and my inner pad was worn at an angle. I disassembled the caliper and it had some light corrosion at the top of the bores which I cleaned up with fine sandpaper (600 grit)., Lubed it up with new brake fluid then bled them. Noise has been gone for a month but I'm going to put new front calipers on it soon.