If your parking brake isn't working correctly, the problem likely lies elsewhere:
* Worn brake shoes: This is the most common culprit. The parking brake uses the rear brake shoes, and if they're worn down, the parking brake won't hold. Replacement is necessary.
* Worn or broken parking brake cable: The cable could be frayed, stretched, or broken. This requires replacing the cable.
* Cable adjustment (at the lever): While there's no external adjustment at the rear brakes themselves, there *might* be a small adjustment at the parking brake lever itself *inside* the car. This is typically a very small adjustment, often a ratchet-type mechanism. Consult your owner's manual to see if your model has one, and how to access it. However, this won't solve most parking brake issues.
* Rear brake drum issues: The rear drums may be corroded or damaged, preventing the brake shoes from contacting properly.
* Low brake fluid: While unlikely to be the sole cause of a failing parking brake, low brake fluid can contribute to reduced braking performance, including the parking brake.
What to do:
1. Check your owner's manual: See if it mentions anything about parking brake adjustment or troubleshooting.
2. Inspect the parking brake cable: Look for visible damage, fraying, or rust.
3. Check the rear brake shoes: This usually requires removing the rear brake drums. If you're not experienced with brake work, take it to a mechanic.
4. Have a mechanic inspect it: If you're not comfortable working on brakes, take your Mustang to a qualified mechanic. Improper brake repair can be dangerous. They have the tools and expertise to diagnose and fix the problem correctly.
Attempting to adjust the parking brake without understanding the system can lead to incorrect adjustment, potentially making the problem worse or creating a safety hazard. Safety should always be the priority when working with brakes.
