ROLLBACK SEAL, DISK BRAKE ASSEMBLY AND CALIPER HOUSING

摘要

PROBLEM TO BE SOLVED: To provide a rollback seal capable of surely returning a piston to a releasing position from a braking position in a disc brake for a bicycle. SOLUTION: The rollback seal is provided with a first ring-like end face 50, a second ring-like end face 52 separated from the first ring-like end face 50 and formed with a ring-like recess 58 thereon, an internal peripheral sealing face 54 extended between the first ring-like end face 50 and the second ring-like end face 52, and an external peripheral sealing face 56 extended the first ring- like end face 50 and the second ring-like end face 52.