Patent ID: 6206484
Filing Date: 2001-03-27
Classification: B60T,H03K

Abstract:
A vehicle brake system comprising:a wheel brake;first and second conduits in fluid communication with said wheel brake;a master cylinder having an outlet in fluid communication with said first conduit for supplying pressurized fluid to said first conduit;a source of pressurized fluid being in fluid communication with said wheel brake via said second conduit;a boost valve regulating the flow of fluid through said second conduit from said source of pressurized fluid to said wheel brake relative to the pressure at the outlet of said master cylinder by a predetermined boost ratio value, said boost valve being adapted to receive pressurized fluid from said first conduit for controlling the operation of said boost valve;an isolation valve movable between a first position, wherein fluid is permitted to flow from said master cylinder to said wheel brake via said first conduit, and a second position, wherein fluid is prevented from flowing from said master cylinder to said wheel brake via said first conduit, said isolation valve being a pilot-operated valve movable between said first and second positions by a pressure differential between said outlet of said master cylinder and the pressure in said second conduit between said boost valve and said wheel brake;a pedal simulator in fluid communication with said first conduit, said pedal simulator being adapted for storage of pressurized fluid.