Why is the S-cam named as such?

The S-cam is named for its distinctive shape, which resembles the letter "S." This cam is a vital component in the air brake systems of heavy vehicles. When the brakes are engaged, the S-cam rotates, causing the brake shoes to push outward against the brake drum. This design enhances the braking efficiency by using the mechanical leverage of the cam shape to amplify the force applied by the air brakes, translating into better stopping power. The visual similarity to the letter "S" is what ultimately gives this component its name, making it memorable and easily identifiable within the context of brake mechanics.