Patent ID: 8838354

Claim:
A combined braking system for vehicles comprising: wheel brakes on a first vehicle axle which are hydraulically activatable; wheel brakes on a second vehicle axle which are electromechanically activatable by electromechanical actuators each having a respective actuation control unit; an electrohydraulic open-loop and closed loop control unit for controlling the brakes on the first axle; wherein the wheel brakes assigned to the second vehicle axle are activated in accordance with a braking request which is predefined at the wheel brakes assigned to the first vehicle axle, or data derived therefrom via a vehicle bus, or in accordance with output signals of a pedal travel sensor or driver braking request-sensing sensor which is of redundant design and which determines an activation travel of a brake pedal or brake operator control element; wherein the wheel brakes on the second axle comprise a parking brake device which is actuatable by a parking brake operator control element; a first communication bus directly connecting the respective actuation control units of the electromechanical actuators, but not directly connecting either of the respective actuation control units of the electromechanical actuators to the electrohydraulic open-loop and closed loop control unit; a second communication bus directly connecting the electrohydraulic open-loop and closed loop control unit to one of the respective actuation control units of the electromechanical actuators, but not directly connecting the electrohydraulic open-loop and closed loop control unit to any other respective actuation control units of the electromechanical actuators; and a third communication bus coupling the electrohydraulic open-loop and closed loop control unit to another one of the respective actuation control units of the electromechanical actuators.