Method for producing a mechanically and preferably machined cast iron or grey cast iron surface, in particular on a brake disc, with increased wear and corrosion resistance, characterized in that said surface is subjected to a water jet treatmentusually according to the so-called fluid jet process, which is adjusted so that it completely or at least partially clears the cavities opened by the machining, which contain a graphite inclusion surrounded by the basic structure, so that in the latter case the level of the graphite inclusion lies below the outer surface of the basic structure surrounding the cavity, whereupon a diffusion layer is applied by nitrocarburizing and an oxide layer is applied on the diffusion layer.

A U-shaped brake rotor including a body that is rotatable around a central axis. The body has an interior to receive a wheel hub, an inboard brake disc, an outboard mounting flange, and an annular wall portion. The outboard mounting flange includes a lug having a through opening to receive a fastener to secure the lug to a wheel mounting flange of the wheel hub. The lug further includes an inboard inclined surface extending radially outward as the inboard inclined surface extends away from the annular wall portion of the body. The inboard inclined surface of the lug extends around the through opening and includes a radially outer portion radially outward of the through opening, a radially inner portion radially inward of the through opening, and an intermediate portion on either side of the through opening and connecting the radially outer and inner portions of the inboard inclined surface.