A steering system for an agricultural vehicle, comprising: - at least one primary controlled axle and at least one further axle, each being associated with at least one steering cylinder for changing a wheel steering angle of the agricultural vehicle, - a valve unit connected to a supply unit for pressurizing the steering cylinders, wherein the valve unit comprises a first steering control and switching unit with a proportional unit and a blocking unit as well as a second steering control and switching unit with a hydraulic device and at least three on-off valves (10, 11, 12), - at least one control device (13, 18), which is configured to control the first steering control and switching unit, wherein the steering system can be operated in a first steering mode and at least one further steering mode, wherein in the first steering mode, the at least one control device (13, 18) is configured to detect and evaluate, by means of a sensor, a steering movement of a steering wheel connected to the second steering control and switching unit in order to control the first steering control and switching unit on the basis of the evaluation, wherein in the first steering mode, the at least one control device (13, 18) is configured to control the at least three on-off valves (10, 11, 12) simultaneously by means of a singular, in particular electrical, signal in order to set at least one actuation characteristic of the steering wheel, wherein the second steering control and switching unit comprises an electrically controlled actuating valve which, when controlled by the electrical signal, provides a switching pressure to the at least one control device (13, 18) which simultaneously pressurises the three on-off valves (10, 11, 12). - at least one primary controlled axle and at least one further axle, each being associated with at least one steering cylinder for changing a wheel steering angle of the agricultural vehicle, - a valve unit connected to a supply unit for pressurizing the steering cylinders, wherein the valve unit comprises a first steering control and switching unit with a proportional unit and a blocking unit as well as a second steering control and switching unit with a hydraulic device and at least three on-off valves (10, 11, 12), - at least one control device (13, 18), which is configured to control the first steering control and switching unit, wherein the steering system can be operated in a first steering mode and at least one further steering mode, wherein in the first steering mode, the at least one control device (13, 18) is configured to detect and evaluate, by means of a sensor, a steering movement of a steering wheel connected to the second steering control and switching unit in order to control the first steering control and switching unit on the basis of the evaluation, wherein in the first steering mode, the at least one control device (13, 18) is configured to control the at least three on-off valves (10, 11, 12) simultaneously by means of a singular, in particular electrical, signal in order to set at least one actuation characteristic of the steering wheel, wherein the second steering control and switching unit comprises an electrically controlled actuating valve which, when controlled by the electrical signal, provides a switching pressure to the at least one control device (13, 18) which simultaneously pressurises the three on-off valves (10, 11, 12).