Method for monitoring the functions of a friction clutch

A method for monitoring the functions of a friction clutch which is arranged in a vehicle between a drive motor and a compressor of a compressed air supply system and which can be disengaged and engaged pneumatically, said method comprising:

• detecting by sensor and evaluating in an electronic control unit at least one operating parameter in a delivery mode of the compressor, wherein when a slipping condition of the friction clutch is identified by the electronic control unit, a value for a cut-off pressure of the compressor stored in the electronic control unit is reduced, wherein in the delivery mode of the compressor, a supply pressure in a main supply line of multiple compressed air consumer circuits or in a supply line of at least one compressed air consumer circuit is continuously detected by sensor, wherein a slipping condition of the friction clutch is identified in that the supply pressure remains at a constant pressure plateau, which is below the cut-off pressure of the compressor, within a predetermined tolerance range and within a predetermined holding time period, and wherein when a slipping condition of the friction clutch has been identified, the delivery mode of the compressor is ended by disengagement of the friction clutch, the value for the cut-off pressure of the compressor is reduced to a corrected cut-off pressure, which lies below the plateau pressure by a predetermined pressure difference, and a warning signal and/or warning information is outputted.