| 摘要 |
A hydraulic brake system (FIG. 2) composed of a master cylinder (30) coupled to the brake pedal (46), wherein there is provided a hydraulic booster (31) with a booster piston (91) and a booster chamber (35), and an auxiliary pressure proportional to the pedal force (F) develops in the booster chamber (35) during braking by way of a brake valve (6) actuated by the brake pedal (46). With the booster (31) intact, the auxiliary pressure prevailing in the booster chamber (35) acts by way of a pressure line (85, 87) on the two-stage piston (20) of a fast-fill cylinder (18), whose small stage (95) is immersed into a filling chamber (22) and, during the brake action, presses the pressure fluid available in the filling chamber (22) by way of pressure line (33) into the one brake line (37) connected to the working chamber (34) of the master cylinder (30). When the booster fails, the two-stage piston ( 20) of the fast-fill cylinder (18) remains in its initial position so that the piston (92) of the master cylinder (30) merely brings about pressure build-up in the two brake circuits (36, 37). The piston is moved by the brake pedal (46) by way of the actuating rod (11) and the piston rod (8).
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