Abstract: A silencer shim structure is mounted on a friction pad of a disc brake assembly by retaining pins which extend through the shim structure and into the backing plate for preventing dislodging of the shim structure in service. The force of the rotating action of the brake disc is at a 90° angle to the retaining pin. This 90° angle provides effective resistance to any shifting or rotation of the shim structure with respect to the backing plate during actuation of a disc brake apparatus. The retaining pin has an outer surface which is disposed substantially flush with the outer surface of the shim structure. The outer surface of the retaining pin therefore does not interfere with the positioning or functioning of an actuator piston structure, caliper structure or other disc brake structure. The flush mounting allows the system of the present invention to be used for any caliper design.