A suspension system for a vehicle, comprising a plurality of suspension cylinders such as shock absorbers (10, 12, 14, 16) which correspond to respective wheels of the vehicle and which have respective hydraulic chambers (28), and a control cylinder (48; 100) having a cylinder housing (52; 104), and a piston assembly (50; 102) which is fluid-tightly and slidably fitted in the cylinder housing and which includes a plurality of pistons (70, 72, 74, 76; 110, 112, 114) and at least one connecting rod (66, 68; 116, 118) connecting the plurality of pistons. The control cylinder has a plurality of hydraulic chambers (70, 72, 74, 76; 130, 132, 134, 136, 138, 140) to which are respectively connected the hydraulic chambers of the plurality of suspension cylinders. The plurality of pistons of the piston assembly include at least two pistons which have respective different diameters. The freedom in connection of the hydraulic chambers of the control cylinder to the suspension cylinders can be increased by arranging the control cylinder such that the pressure-receiving surface areas which receive hydraulic pressures in all of the hydraulic chambers are equal to each other.