Mmmaxx

Hi, recently I have started to notice more and more that when im at a stop and let go of the brake I get this loud noise like something is rubbing against the rotors, not like a brake pad being worn type noise, a louder deeper sound. Its almost like even when im sitting still the car is trying to move at idle speed (trying really hard) cuz when i let go it jumps into the idle speed movement alot quicker. Now I am getting the brake pads changed as per my scheduled maintenance, however is this the problem? I don't think it is myself. Could it have to do with my being an auto tranny always parked on a hill with the e-brake on? Im not sure, but whatever it is, it sounds ghetto and i don't like it at all. If any of you have an ideas or have had this same thing before please let me know, thanks.