I have a 2006 MS6 and I recently changed the rear rotors, pads, and calipers because of a rubbing sound. I now have after two week a sound that is heard when I slow down. it is a thump thump thump that slows as the car slows. This is only on the drivers side rear. I used same parts on the passenger side but no noise. Its sounding like a high spot on the rotor, but after three rotors and two sets of pads I can't figure it out. There is no excess heat and there is nothing getting on the rotor. Please help me with ideas. Again, all parts are new and from diff parts stores. Thanks in advance.