| 摘要 |
<p>A roll back seal (26) is provided for a disc brake assembly (12,14) that reliably returns a piston (24) to a release position from a braking position with an extended sealing life. The present invention also provides a disc brake assembly that includes a calliper housing (20) with at least one piston receiving opening (26), first and second friction members (22) coupled to the calliper housing (20) and one or more pistons (24) movably coupled to the calliper housing (20) to move one or both of the friction members (22). The first and second friction members (22) form a rotor receiving slot therebetween. At least one of the friction members (22) is movably coupled to the calliper housing (20) and at least one piston (24) is movably coupled in at least one piston receiving opening (36) of the calliper housing (20) to move the at least one friction member (22) between a release position and a braking position. The piston receiving opening (36) has an annular side wall (38) with an annular groove (39) formed therein. The annular roll back seal (26) is located in the annular groove (39) between the calliper housing (20) and the piston (24). The roll back seal (26) has first and second annular end surfaces (50,52) and inner and outer annular sealing surfaces (54,56) extending between the first end surface (50) and the second end surface (52). The second end surface (52) has an annular recess (58) formed therein. <IMAGE></p> |
