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An actuator of an antiskid system for a vehicle and which includes a cut-off valve for selectively dividing a hydraulic pressure circuit connecting together a brake master cylinder and a wheel brake cylinder of the vehicle into a brake master cylinder-side hydraulic pressure circuit portion and a wh

An actuator of an antiskid system for a vehicle and which includes a cut-off valve for selectively dividing a hydraulic pressure circuit connecting together a brake master cylinder and a wheel brake cylinder of the vehicle into a brake master cylinder-side hydraulic pressure circuit portion and a wheel brake cylinder-side hydraulic pressure circuit portion.

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An actuator of an antiskid system for a vehicle, comprising: a cut-off valve for selectively dividing a hydraulic pressure circuit connecting together a brake master cylinder and a wheel brake cylinder of said vehicle into a brake master cylinder-side hydraulic pressure circuit portion and a wheel b

An actuator of an antiskid system for a vehicle, comprising: a cut-off valve for selectively dividing a hydraulic pressure circuit connecting together a brake master cylinder and a wheel brake cylinder of said vehicle into a brake master cylinder-side hydraulic pressure circuit portion and a wheel brake cylinder-side hydraulic pressure circuit portion; an accumulator for accumulating a power hydraulic pressure; a piston movable in a first direction by the hydraulic pressure in said wheel brake cylinder-side hydraulic pressure circuit portion as well as movable in a second direction, opposite to said first direction, by said power hydraulic pressure so as to close and open said cut-off valve as well as to increase and restore the volume of said wheel brake cylinder-side hydraulic pressure circuit portion by the movement thereof in the first and second directions; a first changeover valve interposed in a power hydraulic pressure circuit connecting together said accumulator and a fluid chamber which is formed on one of the sides of said piston and to which said power hydraulic pressure is applied, said changeover valve being adapted to remove the power hydraulic pressure in said fluid chamber when a wheel of said vehicle is brought into a state close to a locked stated and to apply the power hydraulic pressure to said fluid chamber when said wheel is in a state other than one close to a locked state; and a second changeover valve interposed in said power hydraulic pressure circuit, said second changeover valve being adapted to open and close said power hydraulic pressure circuit in response to pressing and releasing of a brake pedal such as to remove the power hydraulic pressure in said fluid chamber when closing said power hydraulic pressure circuit.