| 摘要 |
PURPOSE: Boring a hole in the center of an inner caliber of a hydraulic braker piston is provided to increase a pressure of a piston by boring a hole. CONSTITUTION: A hole is bored in the center of an inner caliber of a hydraulic braker piston. Accordingly, a hitting force is intensified by the increase of force of a braker. In addition, the hole functions as a cushion. As power is increased, the hydraulic braker is not broken.
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