Expanding shoe drum brake

摘要

An improved expanding shoe drum brake (10) is provided. The brake includes a pair of brake shoes (20) pivotably retained on an anchor structure (18). The shoes include brake tables (22) and webs (26), the webs are resiliently urged by a spring (132) into constant sliding engagement with three guide surfaces (78, 88 and 114) to locate the webs on a plane (P) relative to the spider and to retain a substantially parallel relationship between the shoe friction material (24) and the brake drum (12) thereby minimizing the required running clearance (44) or slack of the brake.