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the brake shoes are expanded, and rub against the inside of the drum when the brakes are applied. the shoes are pushed apart by a brake cylinder that is operated by hydrolic pressure sent through the brake lines from the master cylinder when you step on the brake pedal. the brake fluid is what is forced througt the brake lines to the wheel cylinders. springs are attached to the shoes ,and pull them back away from the drums when the pedal is released. it is spring action against hydrolic pressure .

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16y ago

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