Calibration method for an electro-hydraulic motor vehicle braking system and associated calibration device

A calibration device for an electro-hydraulic motor vehicle brake system which comprises a piston for building up a hydraulic pressure in the brake system, a first actuator having an electric motor and a second actuator having a brake pedal interface, wherein the first actuator and the second actuator are capable of activating the piston, and wherein a first sensor system is capable of detecting a change in state of the first actuator, and a second sensor system is capable of detecting a change in state of the second actuator, the device comprising:

• an actuation unit which is designed to actuate the electric motor in order to activate the piston by means of the first actuator, wherein the second actuator follows the piston activation;
• a detection unit which is designed to detect, during the piston activation, a first signal which is generated by the first sensor system and permits a conclusion to be drawn about an extent of the piston activation, as well as a second signal which is generated by the second sensor system;
• a calibration apparatus which is designed to calibrate the first signal on the basis of the second signal, or vice versa.