| 摘要 |
A tandem brake booster (10) having a first wall (24) and a second wall (28) which move in opposite directions in response to a pressure differential created by allowing air to be communicated to a control chamber (26) while vacuum is present in operational chambers (20) and (30). As wall (28) moves straps (124 . . . 124N) pulls an annular projection (32) to combine the force produced in the second wall (28) with the force produced in the first wall (24). As the operational force is transmitted into push rod (56) from hub (34), sleeve (37) prevent the reaction disc (50) from being extruded into passage (40) and as such, the reaction force is carried into plunger (64) to provide an operator with an indicator of the operation of the brake booster (10).
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