I am kind of stomped on this brake noise. It makes kind of a scraping noise when braking, kind of like when the brake pads are worn. But I have at least 3/16" left on all the brake pads. The noise stays there upon slow acceleration, then goes away. What can it be? Anyone venture to guess?

I was thinking maybe a sticky caliper not releasing? But then why would it make noise when braking? Don't know.