| 摘要 |
A brake in which friction between a rotating drum and a primary brake shoe produces a force which acts on a secondary brake shoe to move the latter shoe into engagement with the drum to thereby decelerate the drum. A shoe retracting device is mounted on the brake backing plate for operative engagement with a strut which interconnects a pair of adjacent ends of the primary and secondary shoes so that the secondary shoe is withdrawn from engagement with the drum upon brake release.
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