Parking Brake Actuator/Adjuster
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Uses multiplied input force from apply lever to expand parking brake shoe toward the friction surface of the drum-in-hat portion of rear brake rotor. Threaded parking brake actuators are also used to control clearance between parking brake shoe and friction surface of drum-in-hat portion of the rear brake rotor.