Hydraulic assembly for a vehicle brake system comprising at least two brake circuits (102, 104) and wheel brakes (106, 108, 110, 112) associated with the brake circuits (102, 104), the hydraulic assembly comprising: a pressure generator for generating a central hydraulic pressure for the brake circuits (102, 104) independently of a driver at least during a service braking operation initiated by a driver; and at least one pressure adjuster for adjusting for each individual brake circuit the central hydraulic pressure generated by the pressure generator independently of the driver, wherein the pressure adjuster comprises for each brake circuit (102, 104) a first valve device (138, 140) with: at least one adjusting valve (138, 140), which is adjustable at least between an open valve position and a closed valve position to adjust for each individual brake circuit the central hydraulic pressure; a first spring force biased non-return valve (142, 144), which is connected in parallel to the adjusting valve (138, 140) in a way that in the closed valve position enables an overflow of the adjusting valve in the direction of the wheel brakes (106, 108, 110, 112) to further increase the hydraulic pressure held by the closed adjusting valve (138, 140), characterised in that the hydraulic assembly further comprises a changeover device for selectively coupling the wheel brakes (106, 108, 110, 112) to either the hydraulic pressure generated independently of a driver or a hydraulic pressure generated by a driver, wherein the changeover device comprises one 3/2-way valve (120, 122) per brake circuit (102, 104). a pressure generator for generating a central hydraulic pressure for the brake circuits (102, 104) independently of a driver at least during a service braking operation initiated by a driver; and at least one pressure adjuster for adjusting for each individual brake circuit the central hydraulic pressure generated by the pressure generator independently of the driver, wherein the pressure adjuster comprises for each brake circuit (102, 104) a first valve device (138, 140) with: at least one adjusting valve (138, 140), which is adjustable at least between an open valve position and a closed valve position to adjust for each individual brake circuit the central hydraulic pressure; a first spring force biased non-return valve (142, 144), which is connected in parallel to the adjusting valve (138, 140) in a way that in the closed valve position enables an overflow of the adjusting valve in the direction of the wheel brakes (106, 108, 110, 112) to further increase the hydraulic pressure held by the closed adjusting valve (138, 140), characterised in that the hydraulic assembly further comprises a changeover device for selectively coupling the wheel brakes (106, 108, 110, 112) to either the hydraulic pressure generated independently of a driver or a hydraulic pressure generated by a driver, wherein the changeover device comprises one 3/2-way valve (120, 122) per brake circuit (102, 104). at least one adjusting valve (138, 140), which is adjustable at least between an open valve position and a closed valve position to adjust for each individual brake circuit the central hydraulic pressure; a first spring force biased non-return valve (142, 144), which is connected in parallel to the adjusting valve (138, 140) in a way that in the closed valve position enables an overflow of the adjusting valve in the direction of the wheel brakes (106, 108, 110, 112) to further increase the hydraulic pressure held by the closed adjusting valve (138, 140), characterised in that the hydraulic assembly further comprises a changeover device for selectively coupling the wheel brakes (106, 108, 110, 112) to either the hydraulic pressure generated independently of a driver or a hydraulic pressure generated by a driver, wherein the changeover device comprises one 3/2-way valve (120, 122) per brake circuit (102, 104).