Brake booster for automotive vehicles

A brake booster for an automotive vehicle comprising:

• a low-pressure casing sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall, said working chamber being connectible to one of said low-pressure chamber and atmosphere by a mechanically actuated control valve, said casing including a first casing part adjacent said low-pressure chamber having an outer rim at the periphery thereof and a second casing part adjacent said working chamber, said second casing part being a portion of a splashboard of said vehicle having an outer annular sealing surface and an inner annular sealing surface, said movable wall including a rolling diaphragm having an outer sealing bead embracing said outer rim and in a sealed relationship with said outer sealing surface to seal said first and second casing parts and said movable wall to one another;
• and
• a force-transmitting member axially penetrating said movable wall in a sealed relationship therewith, one end of said member being connected to said first casing part and the other end of said member being connected in a sealed relationship with said inner sealing surface.