Patent ID: 7708121

Claim:
A disc brake assembly comprising: a caliper having a recess formed therein; a piston slidably disposed in said recess, said piston having an annular groove formed in an outer side wall thereof; a flexible dust boot seal having a first end and a second end, said first end disposed in an outboard end of said recess and the second end disposed in said annular groove of said piston; and a fluid seal disposed between said caliper and said piston to define a sealed chamber between said piston and said recess; wherein said second end of said dust boot seal is generally circular and includes an inner circumferential surface, an outer circumferential surface, and an end sealing surface at a remote end thereof defined between said inner circumferential surface and said outer circumferential surface, at least one of said inner circumferential surface of said second end of said dust boot seal including a plurality of slots formed therein; wherein when said second end of said dust boot seal rotates within said annular groove in at least a first direction due to a pressure differential exerted across said dust boot seal, said plurality of slots are operative to provide fluid communication between an interior side and an exterior side of said second end of dust boot seal which enables air pressure within said sealed chamber to equalize to atmospheric pressure.