Why are rear self adjusters not operating?

Rear self-adjusters may not operate due to several reasons, including wear and tear, lack of lubrication, or contamination from dirt and debris. If the adjuster mechanism is seized or corroded, it can prevent proper function. Additionally, if the brake shoes are not making adequate contact with the drums, the adjusters may not receive the necessary feedback to adjust. Regular maintenance and inspection can help identify and resolve these issues.