Patent ID: 6860569
Filing Date: 2005-03-01
Classification: B60T

Abstract:
1. A brake system comprising: a normal source of pressurized hydraulic brake fluid; a backup source of pressurized hydraulic brake fluid; a front vehicle brake which is operated by application of pressurized hydraulic brake fluid thereto; a front fluid conduit connecting said front vehicle brake with said backup source; a front isolation valve disposed in said front fluid conduit for selectively preventing the flow of hydraulic brake fluid between said backup source and said front vehicle brake; and a fluid separator unit preventing intermixing of the hydraulic brake fluid of said normal source and the hydraulic brake fluid of said backup source and having a movable pressure boundary which enables, through movement thereof, said normal source of pressurized hydraulic brake fluid to selectively act upon said vehicle brake via a portion of said front fluid conduit when said front isolation valve is shut; a front valve arrangement for selectively supplying pressurized fluid from said normal source to said fluid separator unit and for selectively venting fluid from said fluid separator unit to selectively move said movable pressure boundary; a rear vehicle brake which is operated by application of pressurized hydraulic brake fluid thereto; a rear fluid conduit connecting said rear vehicle brake with said backup source; rear isolation valve disposed in said rear fluid conduit for selectively preventing the flow of hydraulic brake fluid between said backup source and said rear vehicle brake; and a rear valve arrangement for selectively supplying pressurized fluid from said normal source to said rear vehicle brake and for selectively venting fluid from said rear vehicle brake.