With this type of drum brake system, neither shoe pushes against the other.

In a leading-trailing drum brake system, the design allows for one shoe to lead during braking and the other to trail, but importantly, they do not push against each other. This configuration uses the rotation of the drum to enhance the braking effect. When the brake is applied, the leading shoe engages with the drum more effectively, utilizing the direction of the wheel's rotation to create a wedging effect that increases braking force. The trailing shoe, while also in contact, does not have the same leverage, creating a scenario where the two shoes can work together without opposing forces detracting from their individual functions.

This design contrasts with other types of brake systems. In a duo-servo system, for instance, both shoes can push against each other, which can lead to increased braking force but also means that the shoes can create a conflict in movement. Sliding calipers operate in disc brakes, and while they are efficient, they function differently than drum brake systems and are not characterized by shoe interactions as in leading-trailing setups.

Hence, leading-trailing drum brakes represent a balance where each shoe contributes to the braking action effectively without countering the other, highlighting the unique characteristics of this braking system.