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the s cam you are refering to is part of the air brake system on tactor trailers. a relay valve sends air to each brake chamber or pot which moves a rod that has a clevis attached to it that goes to the slack adjuster which is splined to go on the end of an "S" cam. they are called S cams because the shape at the end is like an S.
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Earn +20 ptsQ: What are s cam brakes?
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