BRAKE PISTON, DISC BRAKE, METHOD FOR MANUFACTURING BRAKE PISTON, AND THERMOSETTING RESIN COMPOSITION

摘要

This brake piston (100) is used in a disc brake and is provided with: a piston body (110) comprising a resin member (101); and metallic members (102). The piston body (110) has an opening (120). The metallic members (102) are provided so as to cover side end surfaces (125) of the opening (120) in the piston body (110). The side end surfaces (125) of the opening (120) in the piston body (110) and the metallic members (102) are joined, and the metallic members (102) have roughened layers comprising fine protrusions and recesses and provided on the joining surfaces (103) of the metallic members (102), the joining surfaces (103) being joined to at least the piston body (110). The side end surfaces (125) of the opening (120) in the piston body (110) and the metallic members (102) are joined because portions of the resin member (101) are present within the recesses which constitute the protrusions and recesses of the roughed layers.