A hydraulic assembly for a vehicle braking system comprising at least two brake circuits (102, 104) and wheel brakes (106, 108, 110, 112) associated with the brake circuits (102, 104), wherein the hydraulic assembly is realised in the form of an independently manipulable first subassembly comprising the following: a master cylinder for generating a hydraulic pressure by the driver; a pedal restoration simulation unit, being arranged axially parallel at a side of the master cylinder; a pressure generator having an electric motor, a transmission gear and a cylinder/piston system with a hydraulic chamber and a piston, wherein the position of the piston inside the hydraulic chamber is adjustable by the electric motor; a pressure adjuster for adjusting a hydraulic pressure generated by the pressure generator independently from the driver; a changeover device for selectively coupling the wheel brakes (106, 108, 110, 112) to either the hydraulic pressure generated independently of the driver or a hydraulic pressure generated by the driver; and a valve device located between the changeover device and the wheel brakes (106, 108, 110, 112) for carrying out breaking interventions at the wheel brakes (106, 108, 110, 112) independently of the driver; a housing block for accommodation of valves and pressure sensors of the changeover device, the valve device and the pressure adjuster; and a control unit for electronic control of the pressure generator, the changeover device, the valve device and the pressure adjuster, wherein the housing block is arranged between the control unit and the electric motor; wherein the electric motor is arranged coaxially or axially parallel to the piston of the cylinder/piston system and axially orthogonal to the master cylinder. a master cylinder for generating a hydraulic pressure by the driver; a pedal restoration simulation unit, being arranged axially parallel at a side of the master cylinder; a pressure generator having an electric motor, a transmission gear and a cylinder/piston system with a hydraulic chamber and a piston, wherein the position of the piston inside the hydraulic chamber is adjustable by the electric motor; a pressure adjuster for adjusting a hydraulic pressure generated by the pressure generator independently from the driver; a changeover device for selectively coupling the wheel brakes (106, 108, 110, 112) to either the hydraulic pressure generated independently of the driver or a hydraulic pressure generated by the driver; and a valve device located between the changeover device and the wheel brakes (106, 108, 110, 112) for carrying out breaking interventions at the wheel brakes (106, 108, 110, 112) independently of the driver; a housing block for accommodation of valves and pressure sensors of the changeover device, the valve device and the pressure adjuster; and a control unit for electronic control of the pressure generator, the changeover device, the valve device and the pressure adjuster, wherein the housing block is arranged between the control unit and the electric motor; wherein the electric motor is arranged coaxially or axially parallel to the piston of the cylinder/piston system and axially orthogonal to the master cylinder.