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S-cam drum brakes have an S-cam in each brake chamber. Why is it called an "S-cam?"

A It is shaped like the letter "S."
Explaination
The S-cam really is S-shaped. As it rotates, it forces the brake shoes away from each other and toward the inside of the brake drum.
B It is constantly spinning whenever the wheel is spinning.
C It makes the brake shoes move in an S-shaped path.