| 摘要 |
PROBLEM TO BE SOLVED: To efficiently convert the input load of an operation lever into a hydraulic pressure via light action force at a characteristic point when the hydraulic pressure of a hydraulic master cylinder hydraulically operating the brake or the clutch of a bar handle vehicle is generated or in a normal range and to provide a good action feeling on the operation lever. SOLUTION: The straight line L1 connecting the center O1 of a pivot 28 and the input point of a grip action part 22b is set in parallel with the central axis L2 of a piston 34 when a brake lever 22 is gripped to start the boost of the hydraulic fluid in the hydraulic chamber 37 of the hydraulic master cylinder 21.
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