In a device and a method for actuating a clutch of a transmission for transmitting a torque from at least one drive shaft to at least one driven shaft, at least one hydraulically triggered piston acts on a clutch spring element, and a pump that is hydraulically connected to the piston. A reservoir is provided, which is filled with hydraulic fluid and hydraulically connected to the piston and the pump in such a way that the piston is actuated either by the pump or by the reservoir.