Coupling device for connecting a brake input member with a master brake cylinder and method of operating such a coupling device

The invention relates to a coupling device with a to a brake input member (16) arrangeable input piston (14) and a so to a main brake cylinder (10) arrangeable output piston (12) on which exerted a to the brake input member (16) driver braking force (Ff) via the out is transferable its initial position (s0) by a Einbremsweg (s) reclined of at least a predetermined first minimum Einbremsweg input piston (14), wherein at least in a first operating mode of the coupling device of the out of its initial position (s0) by a Einbremsweg (s) is less than the first minimum Einbremsweg disguised input piston (14) from the output piston (12) is spaced, and wherein in a second mode of operation from its initial position (s0) by a Einbremsweg (s) is smaller than the second minimum Einbremsweg disguised input piston (14) from the output piston (12) is spaced apart, and the driver's braking force (Ff) via the out of its Ausgangsst RECOVERY (s0) by a Einbremsweg (s) reclined between the second minimum Einbremsweg and the first minimum Einbremsweg input piston (14) on the output piston (12) is transferable.