Abstract: The invention provides a hydraulically sealed, variable stiffness servostatic bearing system for use in machine tools and between any other loaded surfaces. Bearing pads operate between two relatively movable surfaces. A pilot valve senses changes in the bearing surface spacing and communicates by pressure variations with a diaphragm controlled restrictor valve. The diaphragm controlled restrictor valve apportions proper amounts of hydraulic fluid at proper pressure to the bearing pads. The combination results in a bearing system the stiffness of which is adjustable from positive to infinite to negative by the source hydraulic pressure to the diaphragm restrictor valve. A lift bladder and a modular bearing pad assembly to facilitate easy and quick installation and removal of bearing pads are also described.