I just had my rotors turned at 55,000 miles. They installed new Wagner pads and after two days the right front started squealing. I took it back in about 2 months, (thinking it might stop squealing) and they put two new front pads on it. Now the left front is squealing. What could be causing this. I will not drive a Hemi with squealing brakes. Any ideas as to why this is happening.