Abstract: Suspension system for a vehicle, comprising two hydraulic piston-cylinder units (1) comprising a first and a second cylinder chamber (3a, 3b), connected with electro-hydraulic roll control means which are arranged to control the vehicle's roll behavior under electric control of the vehicle's computer system (C), comprising a direction valve, a pump unit and pressure control means. The direction valve is a hydraulically actuatable direction valve (6) having two first and two second switching ports (6a, 6b), interconnectable in three positions, and two hydraulic control ports (6c) which are either indirectly or directly, connected with said pump unit (5, 10). The pressure control means comprise an uni-directional pressure control module (9, 15), connected with both second switching ports of the hydraulically actuatable direction valve.