At roughly 15-25 mph if i let off the gas and then get back to it lightly, i'm hearing a, what i would say, metal on metal type sound. It's not real loud but enough to make me wonder what it is and if it's a bad thing. If any of you guys can understand what i mean or have heard the sound in your car please help. it almost sounds like it's coming from the middle of the car, if that helps. It also makes a similar noise when braking for a stop sign at low speeds, could it be the pads shifting, or hopefully not, a worse case scenario. Any help would be greatly appreciated. Thanks in advance.