| 摘要 |
A pneumatic brake servo which can be acted on by a pneumatic differential pressure is described. The brake servo includes an actuable input member comprising a valve piston, an output member for acting on a master brake cylinder, and a control valve which is arranged in a control housing and which can be actuated by the valve piston for controlling the differential pressure. An elastic reaction element is arranged in a control housing recess and against which the output member bears. The input member acts with an input effective area A1 on the reaction element, and the output member acts with an output effective area A2 on the reaction element. The ratio of output effective area A2 to input effective area A1 determines the force boost ratio of the brake servo. Means are provided for adjusting the output effective area A2 in the assembled brake servo.
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