Manual override for an electro-mechanically actuated parking brake system

This invention concerns parking brake systems which, as a rule, are electromechanically actuatable and, under current legal requirements, require an auxiliary actuating device (17) which, upon failure of the electrical system for example, permits auxiliary actuation (release or engagement) of the parking brake system. For embodiments of such electromechanical parking brake systems with electrically actuatable actuators (1) directly on the parking brake, the invention proposes auxiliary actuating devices (17) in several variants which essentially consist of a control element (39) within reach of the driver and operated by muscle power and a transmission element (22, 38, 45). In the process, the transmission of the actuating force can be done both pneumatically and mechanically in case of auxiliary operation or emergency operation, starting from the control element (39) via the transmission element (22, 38, 45) to the actuator (1) and the parking brake. Auxiliary operation using pneumatic power transmission considerably simplifies installation of supply cable for the electromechanically actuatable parking brake provides ease of operation.