| 摘要 |
<p>A vacuum brake booster comprising a power piston (22) defining a first bore (20), limited at one end by a reaction disc (28), and in which is slidably received a plunger (18) linked to an input push rod (12), the power piston (12) defining a second bore (32) in which is mounted a poppet valve (30) adapted to cooperate with a valve seat (48) on the power piston (22) at the erd of the first bore (20) remote from the reaction disc (28) and with the plunger (18), characterized in that the length of the plunger (18) is greater than the length of the first bore (20) between the reaction disc (28) and the valve seat (48).</p> |
