Hydraulic braking system

A hydraulic brake system for a vehicle wherein a portion of a first fluid supplied to a steering system by a first source is selectively diverted to an actuator assembly for a master cylinder to develop an operational force for a second fluid that is supplied to wheel brakes to effect a brake application in response to an operator input force applied to a input member, said hydraulic brake system being characterized by control means which receives a first input signal indicative of the flow of said first fluid from said first source, a second input signal indicative of an input force applied by an operator to effect a desired brake application and a third input signal indicative of the speed of the wheels of said vehicle for developing a an operational signal including a pulse modulated operational signal which is supplied to a magnetic responsive valve through which said first fluid is continuously flowing to a gear in said steering system, said magnetic responsive valve responding to said pulse modulated operational signal by creating a variable orifice between an inlet port and an outlet port to restrict the flow of said first fluid to said gear and increase the fluid pressure of said first fluid, said increase in the fluid pressure of said first fluid being communicated to said actuator assembly to develop said operational force for effecting a brake application, said control means continuing to supply said magnetic responsive valve with a pulse modulated operational signal until braking of the vehicle corresponds to said input force applied by the operator.