When installing uneven brake shoe linings, which shoe lining is traditionally smaller?

When it comes to drum brakes, the primary shoe lining is traditionally smaller than the secondary shoe lining. The primary shoe is designed to provide the initial braking force and is usually positioned toward the front of the axle when applied. This smaller size allows the primary shoe to make contact with the drum first, which is crucial during the braking process.

The secondary shoe lining, by contrast, is larger and typically performs the majority of the braking as it follows the primary shoe during the rotation of the drum. Its larger area is beneficial for maximizing brake efficiency, providing greater surface contact with the drum, and enhancing the overall braking force.

In this context, it's important to understand the function and design of vehicle braking systems. The differential sizing of the shoes is intentional to optimize braking performance, allowing for an effective balance between the two shoes during operation.