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 (55, 60) 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 (55, 60) 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.