Disk brake friction assembly

In a brake backing plate for a brake friction pad in a disk brake assembly, wherein the brake friction pad has a plurality of through bores for receiving a plurality of nips punched through the thickness of the brake backing plate and a plurality of fixation surfaces clinchable by an upper portion of each nip in a riveting step for fastening the brake friction pad to the brake backing plate, the improvement wherein each nip comprises:

• a generally cylindrical, upstanding, cold extruded portion of the backing plate formed from substantially all material of the backing plate under the cold extruded portion with an upper end thereof extending from an upper surface of the backing plate a distance greater than the thickness of the backing plate, said cold extruded portion having a cylindrical cavity extending thereinto from the upper end thereof a distance sufficient to form a cylindrical wall surrounding the cavity that is overturnable in said riveting step so as to be clinchable against the fixation surface but insufficient to pass through the backing plate so as to provide a solid portion of the cold extruded portion between the cavity and a bottom surface of the backing plate.