For the life of me I cannot get these pads to stop squealing! They are semi-metallic. Rotors are in great shape. All moving parts where cleaned and greased. Even tried applying a vibration absorbing coat on back of pads but no luck. Replaced some worn cheapo pads from napa (semi-metallic that NEVER made a noise) with raybestos. The hotter they get the louder & more frequently they squeal.