| 摘要 |
A retraction mechanism for a disc brake assembly which applies a generally constant restoring force urging the brake shoes apart from one another regardless of the amount of wear of the friction pads. The disc brake assembly includes an anchor plate upon which a caliper is slidably mounted. The caliper is formed having an inboard leg and an outboard leg. A cylindrical recess is formed in the inboard leg of the caliper, within which a piston is slidably supported. A pair of brake shoes are disposed adjacent to the inboard and outboard legs of the caliper, and a rotor connected to a rotatable wheel extends therebetween. A mechanism is provided for selectively moving the brake shoes into frictional engagement with the rotor to retard or stop rotation thereof. The retraction mechanism includes a pair of retractor clips which are mounted on the anchor plate for spreading the brake shoes apart from one another when the disc brake assembly is subsequently released. The retractor clips are serpentine-like in shape, having straight portions which are connected together by intermediate curved portions. The outer ends of the retractor clips terminate upwardly extending post portions and outwardly extending finger portions which engage the brake shoes. The forces exerted by the retractor clips on the brake shoes are substantially uniform, regardless of the amount of wear on friction pads of the brake shoes. Thus, such forces cannot overcome the urging of a roll-back seal and undesirably move the piston away from the rotor by a distance which is greater than a desired predetermined distance.
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