| 摘要 |
PURPOSE:To prevent a piston from being exposed in an ambiance of a gasoline vapor by a method wherein a flexible member covering the periphery of the piston is installed. CONSTITUTION:An atmospheric booster 1 installed between a master cylinder 19 and a pedal boosts a damping force by a power piston 3 pressing a piston 22. A flexible member 30 is installed around the piston 22 in order that the piston 22 is not exposed directly in the ambiance of a gasoline vapor. With this, gasoline does not dew on the periphery of the piston 22 and the seal of the master cylinder is not impaired therewith. |
