Importance

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Abstract

Apparatus for controlling brake fluid pressure of a vehicle includes a hold valve provided in a first fluid passage so as to control fluid communication between a fluid pressure chamber in a master cylinder and a wheel cylinder, a decay valve provided in a second fluid passage so as to control fluid communication between a wheel cylinder and a reservoir; a supply valve provided in a third fluid passage so as to control the flow of brake fluid from a fluid pressure source to the fluid pressure chamber; an intake valve normally held in its closed position to shut off the third fluid passage, and a valve operating member mounted on the piston for movement therewith, the valve operating member being engageable with the intake valve when the stroke of movement of the piston reaches a predetermined value to thereby move the intake valve to its open position. With this construction, an anti-lock control for preventing the locking of the vehicle wheels can be effected. Further, an auxiliary piston is provided for moving the first-mentioned piston to applying a braking force when a slip of the vehicle wheels reaches a predetermined level, thereby achieving a traction control.

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First Claim