Patent ID: 8166866

Claim:
A pneumatic brake booster comprising: a booster housing subdivided into at least one working chamber and at least one vacuum chamber by at least one axially movable wall that is configured to be acted upon by a pneumatic differential pressure, a valve piston, an output member for acting upon a brake master cylinder with an output force, a control valve arranged in a control housing and configured to be actuated by the valve piston, wherein the control valve controls the differential pressure, an elastic reaction element arranged in a control housing recess of the control housing, wherein the output member is positioned to bear on the elastic reaction element, and means for setting a distance (z) between the valve piston and the reaction element, wherein the means for setting the distance (z) are provided on the output member, wherein the output member comprises a pressure plate and a pressure rod, the pressure plate bearing against the reaction element and having an axial central through-bore that is sized for receiving and guiding a stem of the pressure rod, wherein the pressure rod includes a means for identifying a length of the stem.