What are the names given to the brake shoes in a dual-servo brake system?

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In a dual-servo drum brake system, the two shoes are designated by their roles: primary and secondary. The primary shoe is the one first acted upon by the wheel cylinder and begins the braking action. Its movement also drives the secondary shoe into contact with the drum through the servo mechanism, amplifying the braking force. The secondary shoe then provides the majority of the braking torque due to its larger contact area and the servo effect. This functional naming is specific to how the duo-servo design works, which is why the correct term is primary and secondary. Other labels like leading/trailing or inner/outer are used in different brake configurations, not this dual-servo setup.