Suspension system for four-wheeled vehicles

Vehicle suspension device for four-wheeled vehicles with at least four hydraulic dampers (32,33,34,35) one provided for each wheel, said hydraulic dampers are in communication with each other in paired relation by a first and second pressure regulating device (40,41) having a high pressure gas chamber means (71,73,97), respectively, wherein the high pressure gas chamber means (71,97) of the first pressure regulating device (40) is in communication with the high pressure gas chamber means (73,97) of the second pressure regulating device (41).