In a dual-servo brake system, which statement is true about the relationship between the primary and secondary shoes?

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Dual-servo brakes rely on a servo action where one shoe drives the other. When hydraulic pressure pushes the primary shoe against the drum, its geometry and backing-plate mounting cause that force to be transmitted to the secondary shoe, pulling it into contact with the drum as well. This amplification increases braking torque without needing extra hydraulic pressure. So the primary shoe applies the secondary shoe. The secondary shoe doesn’t initiate braking on its own, and there is servo action in this design.