HYDRAULICS SENSOR DEVICE FOR A HYDRAULIC BRAKE OR CLUTCH OF STEERING-GUIDED VEHICLES AND HYDRAULIC BRAKE OF A STEERING-GUIDED VEHICLE

The invention relates to a hydraulic actuator device (1), in particular for a hydraulic brake or clutch of handlebar-guided vehicles, with a lever (10) that is rotatably articulated in a receptacle (40), and a hydraulic cylinder (80) that can be arranged in a handlebar tube (20) of the handlebar-guided vehicle and has a piston (73B) displaceably arranged therein, wherein a central valve (750) is arranged in the piston (73B).