| 摘要 |
A brake booster of stroke-enlarging type which includes a power piston disposed in a casing for being actuated by a difference in pressure on opposite sides thereof, a control piston, having therein a control valve for controlling the difference in pressure, being coaxially fitted into a central bore of the power piston relatively movable thereto and a reaction lever, which is abutted at an output portion in the middle thereof by an output member, receiving the output force of the power piston and the output force of the transmission mechanism respectively as an input force at a first input portion and a second input portion thereof located on either side of said output portion, whereby a greater stroke can be obtained at the output member than a stroke applied at an input member.
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