Importance

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Abstract

A disc brake caliper seal arrangement wherein an annular seal is provided between the caliper housing and the outside diameter of the piston provided therein. The seal provides a rollback function which returns the piston to a given running clearance between the disc rotor and brake pads after actuation of the brake. The seal is provided in a substantially square or rectangular cross-sectional configuration and is disposed in a seal groove of the caliper housing. The seal is provided with annular recesses on the ends of the parallel sides of the seal adjacent to the outside diameter of the piston. The central portion of the side of the seal which engages the outside diameter of the piston is provided with a circumferential groove. The recesses provide space of sufficient volume for the seal to deflect into before encountering the straight groove side wall, thereby eliminating the need for a machined chamfer in the housing groove. A groove in the center portion of the seal functions at high braking pressures, such as during a panic stop, to provide additional rollback and to reduce the loss of the required running clearances.

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First Claim