| 摘要 |
PURPOSE: A brake booster prevents accident of a vehicle and lets the old and the weak manipulate a brake pedal easily. CONSTITUTION: A valve plugger which opens and closes an air valve(4) and a vacuum valve(5) by receiving leg power of a pedal is divided into a first and a second valve pluggers(3, 6) mutually connected. A compressed spring(8) pressed with fixed force is interposed between the first and the second valve pluggers(3, 6). The divided two valve pluggers(3, 6) increase mechanical advantage without making the size of a brake booster bigger so as to improve braking performance even with a little amount of leg power, thereby preventing accident of a vehicle.
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