Importance

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Abstract

A drum brake adjustment mechanism is provided to maintain a running clearance between a pair of brake shoes and a rotatable member. The adjustment mechanism includes an extendible member which is disposed between the pair of brake shoes and engageable with a pawl which is pivotally mounted on one of the brake shoes. A .Iadd.single .Iaddend.resilient member encircles the extendible member and engages the other brake shoe and the pawl to bias the pair of brake shoes into engagement with a hydraulic actuator which is operable to urge the pair of brake shoes into engagement with the rotatable member. .[.Moreover, the.]. .Iadd.The single .Iaddend.resilient member cooperates with the pawl to extend the .[.extensible.]. .Iadd.extendible .Iaddend.member when the clearance between the pair of brake shoes and the rotatable member is greater than the running clearance. .Iadd.The pawl defines an arm in abutment with the extendible member and the single resilient member engages the pawl between the abutment and the pivotal mounting to bias the extendible member toward the other brake shoe. .Iaddend.

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First Claim