Patent ID: 7938056

Claim:
Pneumatic brake booster with a booster housing comprising a first and a second housing shell that are connected to each other to form an exterior of the booster housing, the booster housing is subdivided into a working chamber and a vacuum chamber by an axially movable wall, with the movable wall being formed of a diaphragm plate and a diaphragm abutting thereon, the diaphragm including a radially inward sealing bead and a radially outward sealing bead for sealing the two chambers with the radially outward sealing bead compressible between the housing shells, wherein the radially outward sealing bead has a circumferential, uniform rib structure with ribs and rib gaps on a radial inside surface of the sealing bead, wherein the rib gaps extend only partly over the radial inside surface and only partly over an axial side of the sealing bead, and the ribs abut a radial flange of the second housing shell.