Title: Drum brake automatic adjuster

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Abstract: A drum brake assembly includes a pair of brake shoes which are movable by a hydraulic actuator to a position engaging a rotatable member. A backing plate supports the hydraulic actuator and carries an anchor to pivotally support the pair of brake shoes relative to the backing plate. In order to maintain a predetermined running clearance between the pair of brake shoes and the rotatable member, an extendible member cooperates with the brake shoes to limit retraction of the latter. A pawl pivotally engages one of the brake shoes and the extendible member to provide for extension of the extendible member and a resilient member is engageable with the pawl to extend the extendible member and also to retract the pair of brake shoes. The pawl also releasably connects with the extendible member and the one brake shoe when the resilient member is engageable with the pawl. When the resilient member is disengageable from the pawl, the pawl is free to separate from the extendible member and the one brake shoe. Moreover, the pawl defines a floating connection with the one brake shoe and the extendible member so as to tilt into engagement with a ratchet wheel on the extendible member when the resilient member is engageable with the pawl. In particular the floating connection is defined by axial clearances between the pawl and extendible member and between the pawl and one brake shoe.


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