What is the purpose of a slack adjuster in the braking system?

Answer: B — To maintain proper distance between brake shoes and drum

The purpose of a slack adjuster in the braking system is to maintain the proper distance between the brake shoes and the drum. Slack adjusters are essential components of air brake systems and are designed to compensate for the natural wear that occurs in the brake linings over time. As the brake linings wear down, the distance between the drum and shoes increases. If this gap is not properly adjusted, it could lead to reduced braking efficiency, longer stopping distances, and potential safety hazards. By keeping this distance optimal, the slack adjuster ensures that the brakes engage effectively when applied, maintaining a balance between adequate stopping power and safety. This mechanism allows for automatic adjustment of the brake system, contributing to reliable operation and reducing the need for manual adjustments by the driver or maintenance personnel.