Abstract: At four corners of a pressure plate 7, weights 15 are adhered an adhesive agent for high temperature use. When a frictional vibration is generated by frictionally engaging with a rotor in operating a brake, a shim 12 is displaced relative to a pressure plate 7 by inertia of the weight 14. Grease 13 between the shim 12 and the pressure plate 7 flows so as to produce a viscous resistance to a vibration of the shim 12 relative to the pressure plate 7. By the viscous resistance, the vibration of the pressure plate 7 is attenuated, as a result, brake squeal can be restrained from being brought about.