In a drum brake system, the S-cam's role is to push the brake shoes outward against the drum.

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Multiple Choice

In a drum brake system, the S-cam's role is to push the brake shoes outward against the drum.

Explanation:
The S-cam in a drum brake converts the push from the brake chamber into outward motion of the brake shoes. When air pressure moves the push rod, the S-shaped cam rotates and its lobes push the two shoes apart, forcing them to press against the inside of the drum. This contact creates friction to slow the wheel. It isn’t responsible for pulling the wheel to one side, adjusting drum speed, or sealing the brake chamber—those are other functions in the system.

The S-cam in a drum brake converts the push from the brake chamber into outward motion of the brake shoes. When air pressure moves the push rod, the S-shaped cam rotates and its lobes push the two shoes apart, forcing them to press against the inside of the drum. This contact creates friction to slow the wheel. It isn’t responsible for pulling the wheel to one side, adjusting drum speed, or sealing the brake chamber—those are other functions in the system.

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