Abstract: A hydraulic unit for producing brake pressure for a hydraulic motor-vehicle brake system, including a main body, a cavity arranged in the main body and having at least one first bore segment with a defined target diameter, in which a cylindrical piston moveable in the axial direction is arranged, which, in the cavity, bounds at least one pressure chamber filled with a hydraulic fluid, for producing brake pressure in a brake circuit, and at least a first and a second sealing element for sealing off the cylindrical piston, which sealing elements are arranged at an axial distance from each other. In order to provide a hydraulic unit that can be produced more effectively and economically while the technical requirements nevertheless remain fulfilled, the material of the main body in a surface layer of an inner wall of the cavity in the bore segment has a material microstructure that is work-hardened.

Abstract: A hydraulic unit for producing brake pressure for a hydraulic motor-vehicle brake system, including a main body, a cavity arranged in the main body and having at least one first bore segment with a defined target diameter, in which a cylindrical piston moveable in the axial direction is arranged, which, in the cavity, bounds at least one pressure chamber filled with a hydraulic fluid, for producing brake pressure in a brake circuit, and at least a first and a second sealing element for sealing off the cylindrical piston, which sealing elements are arranged at an axial distance from each other. In order to provide a hydraulic unit that can be produced more effectively and economically while the technical requirements nevertheless remain fulfilled, the material of the main body in a surface layer of an inner wall of the cavity in the bore segment has a material microstructure that is work-hardened.