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Question:

The S-cam:

A Forces the brake shoes against the inside of the brake drum.
Explaination

When you push the brake pedal, air is let into each brake chamber. Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake camshaft. This turns the s-cam (so called because it is shaped like the letter \"S\"). The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum.