Cold-worked brake piston

A brake piston for a brake caliper of a disk brake, the brake piston produced using working processes from a metallic material and being configured in one piece as a unilaterally open pot with a piston longitudinal axis A, with a piston wall and with a piston head, wherein at least one locally defined, i.e. partially cold-upset or partially ironed, cylindrical, smooth piston wall portion of the brake piston is provided with a partially deformed piston wall which is configured in an adaptively modifed manner by plastic material deformation by means of material redistribution (flow) including strain-hardening of its piston wall thickness;

• wherein a) the piston wall is drawn in the cylindrical piston wall portion in a locally defined manner to be smooth and groove-free, in that b) the partially deformed piston wall forms a plurality of wall brackets shaped in one piece, wherein each wall bracket protrudes radially towards the piston longitudinal axis A and annularly peripherally in such a way that c) a piston wall thickness S2 is increased in the piston wall portion of the wall bracket in a locally defined manner by a multiple, d) in relation to a wall thickness S1 in a piston wall portion which is arranged laterally offset to the side of the thickened wall bracket;
• and
• wherein the wall brackets are spaced next to one another in a cascaded manner.

A brake piston for a brake caliper of a disk brake, the brake piston produced using working processes from a metallic material and being configured in one piece as a unilaterally open pot with a piston longitudinal axis A, with a piston wall and with a piston head, wherein at least one locally defined, i.e. partially cold-upset or partially ironed, cylindrical, smooth piston wall portion of the brake piston is provided with a partially deformed piston wall which is configured in an adaptively modified manner by plastic material deformation by means of material redistribution (flow) including strain-hardening of its piston wall thickness;

• wherein a) the piston wall is drawn in the cylindrical piston wall portion in a locally defined manner to be smooth and groove-free, in that b) the partially deformed piston wall forms a wall bracket shaped in one piece, which wall bracket protrudes radially towards the piston longitudinal axis A and annularly peripherally in such a way that c) a piston wall thickness S2 is increased in the piston wall portion of the wall bracket in a locally defined manner by a multiple, d) in relation to a wall thickness S1 in a piston wall portion which is arranged laterally offset to the side of the thickened wall bracket;
• and
• wherein each wall bracket and/or protrusion forms at least one axially oriented venting duct.