Importance

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Abstract

A dual-mode drum brake assembly including: (a) a backing plate which is fixed to a vehicle body; (b) first and second arcuate brake shoes disposed on the backing plate; (c) an actuator for moving the two brake shoes away from each other to force the two brake shoes against a brake drum so that the brake assembly acts as a leading/trailing drum brake; (d) an intermediate lever pivotably connected to a web of the first arcuate brake shoe; (e) a second strut associated with the intermediate lever and the second arcuate brake shoe; (f) a positioning spring for positioning the intermediate lever and the second strut in respective positions for their engagement with each other; (g) a first strut engaged with one of the second arcuate brake shoe and the intermediate lever; (h) a parking lever which is engaged with the other of the second arcuate brake shoe and the intermediate lever, and which is operable to be pivoted to be engaged with the first strut whereby the two brake shoes are moved away from each other by a link mechanism constituted by the first and second struts and the intermediate lever, so that the brake assembly acts as a duo-servo brake; and (i) a stopper which limits a displacement of the second strut relative to the intermediate lever in a direction away from the web, for preventing disengagement of the second strut from the intermediate lever.

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First Claim