| 摘要 |
Pneumatic brake booster, in particular for a motor vehicle, comprising a reaction disk ( 30 ) interposed between a plunger ( 28 ) carried by a control rod actuated by the brake pedal and a thrust rod ( 32 ) acting on the primary piston of a tandem master cylinder, the reaction disk ( 30 ) being housed inside an annular metal part ( 36 ) which cooperates with a stop ( 50 ) of the thrust rod ( 32 ) by the intermediary of thermal expansion element ( 48 ) designed to compensate for the thermal expansion of the reaction disk ( 30 ) and its effect on a point of change of assistance ratio.
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