A device for operating a parking brake of a motor vehicle, wherein the parking lock includes an actuatable actuator element for disengaging the parking lock counter to a restoring pressure, and an actuatable holding device for holding the parking lock when the latter is disengaged. Monitoring data storage unit 13 stores monitoring data on the hardware configurations and the software configurations on monitored devices. The inertia ring is constrained from translating in the axial direction and the radial direction with respect to the inner shell and is rotatable with respect to the inner shell in the circumferential direction through a constrained range by compressing the damping pads. The sensor defines a pair of through holes. A blocking member is disposed within the housing adjacent the inlet for preventing upward fluid flow from the inlet directly to the outlet, thereby inhibiting liquid flow through the outlet and into the vehicle space.