Brake fluid pressure control valve responsive to deceleration

摘要

A brake fluid pressure control valve is inserted into a brake line connecting the master brake cylinder to the rear wheels of an automobile, and varies the braking pressure applied to the rear wheel brakes at a predetermined value of deceleration to prevent the rear wheels from locking up. Such a valve includes a main body having cylindrical bores of different diameters including a pressure-regulating piston and a hollow control piston slidably fitted within the cylindrical bores. A ball valve responsive to deceleration is disposed within the hollow of the control piston to selectively open and close a passage connecting the hollow to a pressure chamber. The ball closes the passage when the deceleration of an automobile has reached a predetermined value.