Gm Global Technolgoy Operations, Inc.

Delphi Technologies, Inc.

Huang-Tsang Chang

Schuyler Scott Shaw

Bryan Peter Riddiford

James A Bright

A system and method for monitoring brake pad wear are provided. The system provides a vehicle disc brake caliper assembly including a boot assembly and least one friction pad. The system further provides at least one caliper bolt including a caliper bolt switch point, the caliper bolt movably positioned within the boot assembly. A conductive element is positioned a predetermined distance from the caliper bolt switch point. An electrical circuit is switched when the conductive element contacts the switch point. The contact is established when the friction pad wears to a predetermined level corresponding to the predetermined distance. The method provides a caliper bolt including a caliper bolt switch point. A conductive element is positioned a predetermined distance from the caliper bolt switch point. The predetermined distance is progressively decreased as the brake pad wears. An electrical circuit is switched when the conductive element contacts the caliper bolt switch point.

Disc brake lining wear monitoring system and method

An efficient, cost effective eccentric bearing assembly is provided for use in a multiple piston hydraulic pump. The eccentric bearing assembly includes a roller bearing having an annular race. The race includes a groove around its outside perimeter. The groove engagably receives parti-spherical faces of a pair of opposed pistons. The parti-spherical face evenly loads the race and rollers as the race reciprocates with the eccentric. The invention avoids the use of rotating thrust bearings and instead axially supports the piston clip with stationary surfaces. Placement of the parti-spherical face or an optional conical face, at the interface between the pistons and the grooved race maintains the sliding contact point for piston intake strokes near the center of the face.

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Dayton, OH, United States of America

Huang-Tsang Chang