Something in my rear end is squeeking, of my car, i can only hear it when i slow down, below 10mph, i have a loud exhaust so thats why, so i change my rear brake pads (drum) and it went away for like 4 days. Now its back, same noise....is there something that could be on the pads drum or maybe a piston sticking? this is reallly anoying sound, so anybody got an idea? '92 GT 5.0