| 摘要 |
The invention relates to a power-assisted braking device of the kind having a master piston sliding in a master cylinder, a jack having a piston linked to the master piston by an interconnection such as a rod, a source of auxiliary hydraulic pressure, and a distributor which feeds the jack with auxiliary hydraulic pressure and which is operated by a brake pedal and two mutually articulated levers. The unit consisting of these two levers cooperates with a fixed point and has three working points of which the first cooperates with the pedal, the second cooperates with the distributor and the third cooperates with the master piston. According to the invention, the first and second working points are located on one of the levers (the primary lever) and the fixed point and the third working point are located on the other lever (the secondary lever). This enables the distributor to be acted on directly by the pedal thereby providing more precise operation.
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