An automotive auxiliary assembly vacuum pump includes a housing composite structure with an electric motor section, a pump section, a pump inlet opening, and a pump outlet opening, a motor housing part, a bearing plate which closes the motor housing part proximally, and a pump rotor with a rotor body. The electric motor section includes a motor rotor which is surrounded by the motor housing part and which is closed by the bearing plate. The pump section includes a pump housing which defines a pump chamber and which includes a closure element, at least one pump chamber inlet opening, and at least one pump chamber outlet opening. The pump housing is formed at least by axially proximal and axially distal thrust washers and a radial thrust ring. Only the bearing plate and the axially proximal thrust washer are provided as a single-piece flange element.