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With S-cam drum brakes, when the brake chamber fills with air, air pressure pushes the push rod out, moving the ________ and thus rotating the ________.

A
Explaination
To apply the S-cam drum brakes, air is let into each brake chamber. Air pressure pushes the push rod out, moving the slack adjuster, thus rotating the brake camshaft. As the S-cam on the camshaft rotates, it forces the brake shoes against the inside of the brake drum.