What is the procedure for checking rear brake adjustment on drum brakes?

The procedure for checking rear brake adjustment on drum brakes primarily involves inspecting the star wheel mechanism. This mechanism is responsible for adjusting the brake shoes as they wear down, ensuring that the brakes maintain proper engagement with the drum. By checking the condition and operation of the star wheel, a technician can determine if the brakes are correctly adjusted.

Inadequate adjustment can lead to decreased braking efficiency, uneven brake wear, and increased stopping distances, making this inspection crucial to vehicle safety. The star wheel mechanism is often located inside the drum and can be accessed through an inspection hole or by removing the drum itself, allowing the technician to assess its functionality and make adjustments as necessary.

Other options, while relevant to vehicle maintenance, do not address the specific procedure for checking rear brake adjustment. Brake fluid levels pertain to the hydraulic system, the brake warning light serves as an alert for various issues, and measuring rotor thickness is associated with disc brakes, not specifically rear drum brake adjustments.