In an S-cam brake, what component forces the brake shoes apart and against the drum?
a.The slack adjuster
b.The push rod
c.The S-cam
d.The brake chamber
Explanation
The S-cam is a shaft with a cam shaped like the letter S. When the push rod pushes the slack adjuster, the slack adjuster turns the S-cam, which twists and forces the brake shoes apart and presses them against the inside of the brake drum.