An inboard hub lock assembly integrated into a steering knuckle. The optical deflector is disposed on at least one of the light emitting surface of the light guide panel and a surface opposite to the light emitting surface. The spacer gate of each gate trench may also include a layer of silicide along outer surfaces thereof. The platinum-containing material within the opening may be a plug having a lateral periphery. The inner piston has at the radially outer side or the outer piston at the radially inner side a depression for receiving material particles, which depression is covered by the in each case other piston.