| 摘要 |
A braking device for motor vehicles comprises a main brake cylinder and a differential piston (1). The differential piston (1) has a plurality of useful pressure surfaces (6, 7, 8) which may be connected or disconnected according to the needs by appropriate control devices (servo valves (13, 14)). Said device enables to regulate the pressure in the brake line independently from the power supplied by the differential piston (1). It enables to prevent to a large extent the blocking of the wheels of the vehicle.
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