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A hydraulic system (10) having a pump (12) for sequentially supplying a brake booster (14) and a steering gear (16) with hydraulic fluid to an assist in effecting a brake application and/or a steering application. The brake booster (14) has a housing (100) with a chamber (102) therein connected to a

A hydraulic system (10) having a pump (12) for sequentially supplying a brake booster (14) and a steering gear (16) with hydraulic fluid to an assist in effecting a brake application and/or a steering application. The brake booster (14) has a housing (100) with a chamber (102) therein connected to a first bore (104) which retains a piston (108) connected to a master cylinder (112) and a second bore (106) which retains a control valve (114). The second bore (106) has an inlet port (118) connected to the pump (12) for receiving supply hydraulic fluid, an outlet port (120) connected to the steering gear (16) and a return port (120) connected to the pump (12). Linkage (144) responsive to an input member (152) moves the control valve (114) to initially terminate communication from the second bore (106) to the return port (120) and direct the flow of a first portion of the supply hydraulic fluid to the chamber (102) to effect a brake application while a second portion thereof is communicated to the steering gear (16). A regulator (24) is connected to the pump (12) for receiving and directing the flow of supply hydraulic fluid to the inlet port (118) of the housing (100) of the booster (14). The regulator (24) responds to a preset hydraulic fluid pressure in the first portion of the supply hydraulic fluid by metering the flow of the supply pressurized hydraulic fluid to the inlet port (118) of the brake booster and thereafter directly communicating a corresponding portion of the supply hydraulic fluid through a port (210) to the steering gear (16). The regulator (24) on metering the supply hydraulic fluid to the inlet port (118) establishing a maximum limit for the hydraulic pressure in that portion of the supply hydraulic fluid presented to the control chamber (102) and to a chamber (182) in an associated accumulator (40).

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1. In a hydraulic system having a pump for sequentially supplying a brake booster with supply hydraulic fluid to assist in effecting a brake application and supplying a steering system with supply hydraulic fluid to assist in a steering application, said brake booster having a housing with a control

1. In a hydraulic system having a pump for sequentially supplying a brake booster with supply hydraulic fluid to assist in effecting a brake application and supplying a steering system with supply hydraulic fluid to assist in a steering application, said brake booster having a housing with a control chamber connected to a first bore with a piston therein and a second bore with a control valve therein, said piston being connected to a master cylinder, said second bore having an inlet port connected to said pump for receiving supply hydraulic fluid, an outlet port connected to the steering gear and a return port connected to a reservoir of said pump, linkage means responsive to an input member for moving said control valve to initially terminate communication between said second bore and said reservoir by way of said return port and thereafter restricting the flow of said supply hydraulic fluid presented to said inlet port by flowing a first portion to said control chamber while directing the flow of a second portion of said supply hydraulic fluid to said steering gear, said first portion of said supply hydraulic fluid acting said piston to provide a master cylinder with an operational force to produce a brake application in wheels of a vehicle, said hydraulic system being characterized by regulator means connected to said pump for receiving and directing the flow of said supply hydraulic fluid to said inlet port of said housing of said booster, said regulator means responding to a preset hydraulic fluid pressure in said first portion of said supply hydraulic fluid presented to said chamber by metering the flow of said supply hydraulic fluid to said inlet port of said brake booster and thereafter directly communicating a corresponding portion of said supply hydraulic fluid to said steering gear, said regulator means on metering the flow of said supply hydraulic fluid to said inlet port establishing a maximum limit for the hydraulic pressure in said first portion of said supply hydraulic fluid as presented to said control chamber.