| 摘要 |
A pressure medium operated vehicle brake system is proposed which is fed by an external power supply system (3) and has a master cylinder arrangement (1), in which a booster piston (40) which can be acted upon by the external power is displaceable in a pressure medium chamber (26). When the external power system (3) is intact, the booster piston (40) has an effective surface for the pressure actuation of a wheel brake cylinder, which is greater than an effective surface set in the event of a failure of the external power supply system. In the event of a failure of the external power supply system (3) the required braking is obtained with less foot force (F) owing to a reduced effective surface on the booster piston (40) with a larger displacement travel of the booster piston (40). <IMAGE>
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