Patent ID: 8607689

Claim:
A hydraulic braking system comprising: a fluid cylinder in communication with a source of hydraulic fluid and defining a cylinder bore; a piston slidably disposed within said cylinder bore, said piston including a piston body having an outer surface and defining at least one annular groove opening toward said cylinder bore, said annular groove defining a first side wall and a second side wall both of which terminate at said piston body outer surface, and a base wall disposed between said first side wall and said second side wall; and a sealing member disposed within said at least one annular groove, said sealing member including a seal body having an outer sealing surface arranged to contact said cylinder bore and a glide ring at least partially disposed within said outer sealing surface of said seal body, said glide ring including a first side in contact with said seal body and a second side spaced from said first side, wherein said seal body defines a relief portion disposed radially inward from said first side wall, said first side wall extending across the entire relief portion and defining an unobstructed space between said relief portion and said first side wall, said unobstructed space configured to receive a fluid.