| 摘要 |
The invention mainly concerns a servo brake booster with variable jump. A first jump value corresponds to a comfort braking phase and a second value corresponds to an emergency braking phase. The inventive servo brake booster comprises a casing (3) wherein is mounted sealingly sliding a skirt (13), a piston (15) integral with the skirt (13) and a three-way valve (18) arranged in the piston body (15), said valve (18) including a plunger distributor (42) bearing a probe (52), the probe part (52) capable of being urged to be in contact with a reaction disc (95), being formed by one first end of a web (48) and one first end of a sleeve (39) enclosing said web. For a speed higher than a predetermined speed (Vs), the first end of the sleeve (39) has an offset position relative to the first end of the web (48).
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