Master cylinder and brake booster assembly

A brake control unit for an automotive vehicle, comprising a low pressure booster with a hermetically closed housing having two opposite walls, and a brake master cylinder connected to a first of said opposite walls, a movable piston wall dividing interiorly said housing into a vacuum chamber to be permanently connected to a vacuum source and a control pressure chamber adjacent the first wall of said housing, said piston wall being movable axially in response to actuation of a control valve by a control rod extending longitudinally through said master cylinder, the control valve being arranged centrally on said movable wall and selectively controlling communication of the control pressure chamber with the atmosphere, said control valve housed in a control valve casing, an opening being formed in the second of said opposite walls and the second wall opposite said master cylinder, said master cylinder having a housing and slidingly receiving therein at least a primary piston connected to said movable wall by an elongated actuation member, means on said master cylinder for mounting said unit on a stationary support of said vehicle, the elongated actuation member being tubular and extending longitudinally centrally through said master cylinder and the control rod extending slidably within the tubular elongated actuation member, the control valve comprising a first admission valve member on an atmospheric side of said control valve and operatively connected to said control rod, said control valve also disposed in a movable wall tubular hub portion extending axially in the vacuum chamber, the tubular hub portion sealingly extending through said opening in said second wall, the control valve casing in constant communication with the atmosphere and the control valve disposed outside the booster directly in front of the second wall and remote from the master cylinder.