Practice question

What is the function of the S-cam in drum brakes?

To hold the brake shoes in place
To convert linear motion from the slack adjuster into the spreading motion that pushes brake shoes against the drum
To cool the brakes
To measure brake wear

Answer: B — To convert linear motion from the slack adjuster into the spreading motion that pushes brake shoes against the drum

The correct answer is shown above. Try the full quiz for additional practice.