Abstract: A fluid pressure control method of an anti-skid control apparatus for a vehicle, wherein the anti-skid control apparatus includes a tandem master cylinder, wheel cylinders of wheels, wheel speed sensors associated with the respective wheels, a control unit receiving the outputs of the wheel speed sensors for judging skid conditions of the respective wheels, and fluid pressure control valves arranged between the tandem master cylinder and the respective wheels, which receive instructions from the control unit for controlling brake fluid pressures of the respective wheels. The control unit supplies brake-decreasing instructions and brake-holding instructions independently to the ones of the fluid-pressure control valves for the front wheels, controls the others of the fluid-pressure control valves for the rear wheels by the diagonal "Select Low" between the skid conditions of the respective rear wheels and respective front wheels diagonally connected to the respective rear wheels.