Patent ID: 6217132
Filing Date: 2001-04-17
Classification: B60T,Y10S

Abstract:
A vehicle brake system comprising:a wheel brake;a master cylinder operable to provide pressurized fluid to said wheel brake, said master cylinder including a housing having a bore formed therein, said master cylinder further including a piston slidably disposed in said bore, said piston having a ramped surface formed thereon;a fluid conduit between said master cylinder and said wheel brake, wherein movement of said piston with said bore of said housing of said master cylinder causes an increase in fluid pressure in said conduit for actuation of said wheel brakes;a fluid reservoir being in selective fluid communication with said bore of said master cylinder;an isolation valve movable between an open position, wherein fluid is permitted to flow between said master cylinder and said wheel brake, and a closed position, wherein fluid is restricted from flowing between said master cylinder and said wheel brake;a dump valve movable between a closed position, wherein fluid is prevented from flowing between said wheel brake and said reservoir, and an open position, wherein fluid is permitted to flow between said wheel brake and said reservoir; anda cut-off valve movable between an open position, wherein fluid is permitted to flow between said dump valve and said reservoir, and a closed position, wherein fluid is restricted from flowing between said dump valve and said reservoir, said cut-off valve having a contact member in sliding engagement with said ramped surface of said piston said master cylinder, wherein said cut-off valve is mechanically actuated between said open and closed positions by the cooperation of said contact member and said ramped surface.