Clutch system for coupling torque of an engine towards a drive system, comprising: - a pressurizable clutch arrangement comprising: - a clutch disk and clutch pressure plate to be coupled for transmitting the drive torque from the engine towards the drive system, and - a pneumatic clutch actuator system for actuating the clutch pressure plate in and out of coupling engagement with the clutch disk ; said pneumatic actuator system having a working stroke that, upon pressure release, is arranged to control a relative coupling distance of the clutch pressure plate in increasing friction engagement with the clutch disk , until, in fully released condition, the clutch disk is fully coupled to the clutch pressure plate ; - a pressure supply mechanism for pressuring the clutch arrangement, in order to couple the clutch arrangement; - a pneumatic pressure sensor , for sensing a working pressure of the clutch arrangement, during the working stroke; - a controller , for controlling actuation of the pneumatic clutch actuator system , wherein the controller is provided with a calculation module , that calculates one or more touchpoints of the friction engagement based on sensed working pressures of the pneumatic pressure sensor during the working stroke, characterized in that a touchpoint is calculated from a mean pressure value derived from an inner hysteresis contour of the pressure map of sensed pressures in the coupling and decoupling working strokes. - a pressurizable clutch arrangement comprising: - a clutch disk and clutch pressure plate to be coupled for transmitting the drive torque from the engine towards the drive system, and - a pneumatic clutch actuator system for actuating the clutch pressure plate in and out of coupling engagement with the clutch disk ; said pneumatic actuator system having a working stroke that, upon pressure release, is arranged to control a relative coupling distance of the clutch pressure plate in increasing friction engagement with the clutch disk , until, in fully released condition, the clutch disk is fully coupled to the clutch pressure plate ; - a clutch disk and clutch pressure plate to be coupled for transmitting the drive torque from the engine towards the drive system, and - a pneumatic clutch actuator system for actuating the clutch pressure plate in and out of coupling engagement with the clutch disk ; said pneumatic actuator system having a working stroke that, upon pressure release, is arranged to control a relative coupling distance of the clutch pressure plate in increasing friction engagement with the clutch disk , until, in fully released condition, the clutch disk is fully coupled to the clutch pressure plate ; - a pressure supply mechanism for pressuring the clutch arrangement, in order to couple the clutch arrangement; - a pneumatic pressure sensor , for sensing a working pressure of the clutch arrangement, during the working stroke; - a controller , for controlling actuation of the pneumatic clutch actuator system , wherein the controller is provided with a calculation module , that calculates one or more touchpoints of the friction engagement based on sensed working pressures of the pneumatic pressure sensor during the working stroke, characterized in that a touchpoint is calculated from a mean pressure value derived from an inner hysteresis contour of the pressure map of sensed pressures in the coupling and decoupling working strokes. <EOS>