What consequence arises from excessively worn brake shoes in a drum brake system?

Excessively worn brake shoes in a drum brake system can significantly damage the brake drums, leading to more extensive and costly repairs. When brake shoes become worn down, they lose their ability to frictionally engage the drums effectively, which can generate excessive heat and lead to further degradation of the drum material. This damage can include grooves, warping, or even cracks in the drums themselves. Repairing or replacing damaged drums is typically far more expensive than replacing worn brake shoes, emphasizing the importance of regular brake maintenance. In contrast, the other choices suggest outcomes that do not logically follow from having excessively worn brake shoes, making this option the most accurate and relevant consequence.