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It depends on where the shoe anchor pin and the threaded star adjustment rod is located. If the shoe anchor is located at the top of the backing plate with the adjustment rod at the bottom between the two shoes than it is duo-servo. If the adjustment rod is located at the top between the two shoes and the anchor pin is at the bottom of the backing plate then it is a leading/trailing type drum brake system.

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Q: Does a duo-servo brake drum have a horseshoe-like return spring?
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