The S-cam forces the brake shoes against the drum and spreads them apart.

True. Section 5.1: The S-cam rotates and pushes the shoes apart against the drum.

The S-cam forces the brake shoes against the drum and spreads them apart.

ANSWER BREAKDOWN
  • A. Correct. The S-cam rotates and pushes the shoes apart against the drum.
  • B. Incorrect. "False" is not correct. The S-cam rotates and pushes the shoes apart against the drum.
  • C. Incorrect. "Only in disc brakes" is not correct. The S-cam rotates and pushes the shoes apart against the drum.
  • D. Incorrect. "Only in wedge brakes" is not correct. The S-cam rotates and pushes the shoes apart against the drum.