I have a 1996 Mustang GT. The rear right brake squeaks consistently at one spot on the rotor, sometimes two, adjacent to eachother. I replaced the rotor, which I believed was warped, and pads in January and the outside pad is currently worn to the rivets while the inside pad is worn as it should be after 3 months. The last tire may not have been properly balanced, but with new, balanced tires on, the problem persists. Any help?