Confirmation means door wear with play equipment elements

To provide for an actuating device for wear with play machine elements, in particular for brakes of rail vehicles, with an actuating force-producing piston-cylinder unit which cooperates the piston rod with a wear-play compensating adjusting device, the wear clearance offset the operating force to the operable machine element is available, to enable a simple and low-wear wear clearance adjustment , it is proposed DOLLAR a that the adjusting device is constructed in the manner of a hydraulic piston-cylinder unit (2) for wear compensation of play, by extending an adjusting piston (23) takes the wear clearance adjustment, a sensor element detects wherein for actuating the wear-induced play and, on reaching a wear limit game to open a valve (14) using the operating pressure of the operating force generating piston-cylinder unit (1) the nachs tellende piston-cylinder unit (2) supplied with hydraulic fluid.