Method of connecting a master brake cylinder to a brake booster and the assembly resulting from this method

Claim 1

A brake unit comprising: a master brake cylinder; and a brake booster including a booster casing, a movable wall disposed in said casing to subdivide said casing into a vacuum chamber and a working chamber, a reinforcing tube disposed in said casing extending axially between both transverse end walls of said casing, one end of said tube being fastened to one of said transverse end walls adjacent said working chamber, said movable wall being sealed to and axially displaceable relative to said tube, and a control valve to control the pressure in said working chamber, said tube having the other end thereof overlapping an area of an adjacent end of said master cylinder, and said tube is connected to said adjacent end of said master cylinder by a plastically deformed portion of said tube disposed in said overlapping area; said master cylinder including an outwardly extending projection adjacent said overlapping area and said other of said transverse end walls adjacent said vacuum chamber including an axially, outwardly extending extension sealingly engaging the outer circumferential surface of said outwardly extending projection and at least a portion of a transverse wall of said outwardly extending projection remote from said overlapping area to lock said master cylinder to said booster casing.