FIELD: transport engineering; brake systems. SUBSTANCE: lever 1 is connected with brake drive shaft through worm wheel. Worm wheel 2 and worm 4 form adjusting device. Adjuster drive is made in form of gear rim 8, toothed rack 9, gear 12 and overrunning clutch. Cavities are made in housing 25 at both end faces of toothed rack 9 to provide travel of rack exceeding clearance in brake. "Play" device in form of meshed gear 12 and race of overrunning clutch is provided. With wear of shoes and drum, clearance between them increases. Device provides automatic increase of turning angle of lever 1 to provide tight contact between shoes and drum. EFFECT: improved reliability of braking. 4 cl, 4 dwg
