Final answer:
The secondary/trailing shoe in a drum brake system is designed to face the rear of the vehicle, which is a design choice based on the drum rotation and brake mechanics.
Step-by-step explanation:
The question pertains to the configuration of drum brakes, specifically the orientation of the secondary or trailing shoe within the assembly. In a drum brake system, the secondary/trailing shoe is designed to face towards the rear of the vehicle. This is because the trailing shoe is less effective at generating friction compared to the leading shoe due to the rotation direction of the drum, and placement towards the rear utilizes this characteristic during brake application.