MANOVRERINGSANORDNING FOR ETT HYDRAULISKT BROMSSYSTEM MED SLIRREGLERING VILKEN I HUVUDCYLINDERN HAR EN TVADELAD KOLV SOM ER GLIDBART STYRD I EN POSITIONERINGSHYLSA

摘要

An actuating device for a vehicle hydraulic brake system of the type having electromagnetically operated valves in the hydraulic circuits to each wheel brake for providing slip control wherein the device includes a master cylinder having a brake pedal force responsive hydraulic booster piston for actuating a master cylinder piston slidably mounted within a slidable positioning sleeve within the bore of the master cylinder. The positioning sleeve is adapted to be mechanically coupled to the booster piston in the brake actuation direction. A stationary projection on the interior end of the master cylinder protrudes into the positioning sleeve and cooperates with the sleeve and master cylinder piston to vary the master cylinder volume. A hydraulic change-over valve directs pressurized fluid during operation of the slip-control valves to the positioningsleeve in opposition to the actuating force to reset the brake pedal and supply pressurized fluid to the wheel brake lines to replenish fluid depleted during operation of the slip control cycle.