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The S cam brake system is commonly used on big trucks, semi's and trailers. The brake shoes are operated by a cam shapped like and "S". The S cam is operated by air pressure usaully. So when the driver applies the brake pedal air is supplied to a brake cannister at each wheel which rotates the S cam which expands the grake shoes into the drum.
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Earn +20 ptsQ: What is a S- cam brake?
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