Kelsey-hayes Company

Serge G Avenel

Glenn R Gualdoni

Patrick H Hool

Frank P Lubischer

Norbert Sternal

A vehicle brake system including a wheel brake and a master cylinder operable to provide pressurized fluid to the wheel brake. The master cylinder includes a housing having a bore formed therein, and further including a piston slidably disposed in the bore. The brake system further includes a fluid reservoir in selective fluid communication with the bore of the master cylinder. The brake system also includes an isolation valve movable between an open position, wherein fluid is permitted to flow between the master cylinder and the wheel brake, and a closed position, wherein fluid is restricted from flowing between the master cylinder and the wheel brake. The brake system further includes a dump valve movable between a closed position, wherein fluid is prevented from flowing between the wheel brake and the reservoir, and an open position, wherein fluid is permitted to flow between the wheel brake and the reservoir. The brake system additionally including a cut-off valve movable between an open position, wherein fluid is permitted to flow between the dump valve and the reservoir, and a closed position, wherein fluid is restricted from flowing between the dump valve and the reservoir.

Hydraulic control unit having a master cylinder and anti-lock braking valves integrally mounted therein

A master cylinder for a vehicle hydraulic brake system, in which the master cylinder includes a body having a stepped bore formed therethrough and at least one piston disposed within the stepped bore. A plug is preferably permanently fixed to one end of the bore providing for a leak tight seal at the end of the bore. The master cylinder preferably includes a spring assembly having a pin with a longitudinally regular end portion which is retained in a bore of the piston.

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Novi, MI, United States of America

Serge G Avenel