What happens to slack as the brake linings wear?

As the brake linings wear down over time, the distance between the brake shoes and the brake drum increases. This increasing distance results in additional slack in the brake system. Slack is the space that develops when the brake components no longer fit snugly due to wear. When the brake linings wear, the effective braking surface is reduced, and the system needs to compensate for this by allowing more slack to accommodate the distance created by the worn linings. This accumulation of slack can lead to less effective braking performance if not adjusted or addressed properly. Therefore, the correct answer reflects the natural progression of wear in brake linings and its impact on the system.