Principles of Operation
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
When the parking brake control is pressed, tension is applied to the front parking brake cable. This tension pulls on the RR parking brake cable, which is attached to the RR brake shoe actuator and applies the RR brake shoes. At the same time, the tension in the front cable causes the front cable conduit to attempt to straighten out. This straightening effect causes the front cable conduit to pull on the LR parking brake cable, which is attached to the LR brake shoe actuator and applies the LR brake shoes.