| 摘要 |
A hydraulic piston for a disc brake assembly includes a metallic cylinder with a bottom at one end and a hollow resin cylinder with an opening at each end. The hollow resin cylinder is disposed in an inner surface of the metallic cylinder and closes the opening at one end of the hollow resin cylinder. The hollow resin cylinder further includes a main part disposed in the inner surface of the metallic cylinder and a flange portion having an outer diameter which is wider than the outer diameter of the main part of the hollow resin cylinder. The flange portion is formed on the main part at the other end of the hollow resin cylinder, integrally or with a separate member. An annular groove is defined between the flange portion and an open end of the metallic cylinder.
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