DE 10 2014 204 287 A1 discloses a method for operating a motor vehicle brake device which has at least one electronic parking brake with at least one actuator, wherein when a first switching signal is applied to a switching signal input the actuator is actuated in order to activate the parking brake. It is proposed that the switching signal input be enabled in a normal operating mode to apply any desired switching signals and be fixedly set, in a safety operating mode, to a second switching signal which is different from the first switching signal, with the result that the actuation of the actuator for activating the parking brake is prevented.
USPTO Backgrounds
USPTO Backgrounds