Compensating reservoir for a hydraulic motor vehicle brake system

A compensating tank for a hydraulic motor vehicle brake system comprising:

• a housing including a housing upper part and a housing lower part;
• a device for monitoring a filling level of the compensating tank, said device including a switching unit, which is attached to the housing and has a plug connector, and a sensor which is configured to be switched by a transducer at a switching point (S) at which the switching unit generates a signal for an electronic control unit, wherein the housing includes a depression for receiving the switching unit, with the switching unit having an elongated base body which extends between the plug and a support element that is positioned within the housing and includes an underside surface which is attached to the housing in the depression, wherein the depression is sized such that a topside surface of the base body of the switching unit and a planar topside surface of the housing are substantially co-planar to form a substantially continuous surface on the topside surface of the housing;
• and
• means for aligning the switching unit that are provided in the depression of the housing, said means for alignment being configured for maintaining a pre-determined position of the switching point (S) with respect to the compensating tank,
• wherein the elongated base body is welded to the housing in the depression,
• wherein the means for alignment comprise a projection-recess arrangement, and
• wherein projections are provided on the underside surface of the elongated base body and recesses are arranged in the depression for receiving the projections.