Final answer:
To address uneven brake wear on one side of the shoes, it is most likely to involve anchor pins and bushings which are crucial for allowing brake shoes to pivot evenly. Other issues such as worn S-cam bushings or an ABS sensor could contribute but are less likely the cause for this specific symptom.
Step-by-step explanation:
If the brake wear is uneven on only one side of the shoes, it is important to inspect several components that can contribute to this issue. While all the options provided could potentially explain brake issues, anchor pins and bushings are most commonly associated with uneven wear confined to one side. The anchor pins and bushings are critical components in brake assemblies as they allow the brake shoes to pivot smoothly and evenly when pressure is applied. If these parts are worn or not functioning properly, it could lead to uneven wear. Worn S-cam bushings can also cause uneven wear, but usually this affects both brake shoes on the same axle, not just one side. An ABS sensor being out of adjustment would typically cause an ABS fault code or light and potentially erratic braking behavior, but not usually uneven wear on one side. Improper sized shoes would likely create issues on both sides of the brake assembly.