The S-cam:

Forces the brake shoes against the drum.. Section 5.1: The S-cam rotates and forces the brake shoes away from one another and presses them

The S-cam:

ANSWER BREAKDOWN
  • A. Correct. The S-cam rotates and forces the brake shoes away from one another and presses them against the inside of the brake drum.
  • B. Incorrect. "Controls the air pressure." is not correct. The S-cam rotates and forces the brake shoes away from one another and presses them against the inside of the brake drum.
  • C. Incorrect. "Is part of the steering." is not correct. The S-cam rotates and forces the brake shoes away from one another and presses them against the inside of the brake drum.
  • D. Incorrect. "Is a type of tank." is not correct. The S-cam rotates and forces the brake shoes away from one another and presses them against the inside of the brake drum.