If your parking brake isn't working correctly, the problem likely lies in one of the following areas, and requires professional repair or replacement:
* Worn-out brake shoes: The parking brake shoes are part of the rear drum brake assembly. They wear down over time and need replacing. This is the most common cause of a weak or ineffective parking brake.
* Cable issues (less likely, but possible): While there's no external adjustment, the cables connecting the parking brake lever to the rear brakes *can* stretch or break. This is less common than worn shoes.
* Internal mechanism failure: Problems within the parking brake mechanism itself inside the rear drum assembly are possible, though less frequent than worn shoes.
* Contamination: Dirt, rust, or other contaminants can interfere with the proper functioning of the brake mechanism.
Therefore, instead of trying to adjust it yourself (which isn't possible in the way you might expect), take your Crown Victoria to a qualified mechanic or brake specialist. They have the tools and expertise to diagnose the exact problem (likely worn brake shoes) and perform the necessary repairs or replacements. Attempting to adjust it yourself could lead to further damage and compromise your vehicle's safety.