Before you start, always consult a repair manual specific to your 1994 Mustang. This will give you diagrams and torque specifications crucial for a successful repair. Improperly installed brakes are dangerous.
Here's a general process, but remember your car might be slightly different:
1. Safety First: Engage the parking brake firmly. Jack up the rear of the car securely and use jack stands. Never work under a car supported only by a jack. Block the front wheels.
2. Wheel Removal: Remove the rear wheel.
3. Caliper Removal (if necessary): Some people remove the caliper completely, making it easier to access the pads. Others can manage with the caliper loosely hanging from the brake line. If you remove it, support the caliper with a bungee cord or wire to keep tension off the brake line. You may need to loosen the caliper mounting bolts.
4. Emergency Brake: The emergency brake (parking brake) mechanism is usually integrated into the rear calipers on a 94 Mustang. This is why the piston might be difficult to move. The emergency brake cable likely needs to be loosened. Locate the cable where it connects to the caliper. There should be a mechanism (possibly a star-shaped adjuster or a simple cable clip) allowing you to loosen the cable. Use an appropriate tool to adjust it slightly. This will allow the caliper to be easier to move in and out. *You'll need to refer to your repair manual for the exact location and method.*
5. Pad Removal: Remove the old brake pads. They should slide out relatively easily.
6. New Pad Installation: Install the new brake pads. Make sure they sit correctly in their respective slots.
7. Caliper Reinstallation (if removed): Carefully reinstall the caliper if you removed it earlier. Tighten the mounting bolts to the proper torque specification (consult your manual).
8. Wheel Reinstallation: Reinstall the wheel and tighten the lug nuts to the proper torque specification.
9. Testing: Lower the car, and carefully pump the brake pedal several times to ensure the pads are engaging the rotors. Test drive the car slowly at first. You'll probably feel a difference in the brake feel as the pads bed in over time.
If the piston still won't retract after loosening the emergency brake cable:
* Caliper Rebuild/Replacement: The piston might be seized or the caliper might be damaged. A caliper rebuild kit might be necessary, or you might need a replacement caliper.
* Compression Tool: You might need a specialized caliper piston compression tool. These tools help retract the piston safely without damaging it. Auto parts stores sell them. But, this is usually unnecessary with the 1994 Mustang's self-adjusting rear calipers, provided the emergency brake cable is properly adjusted.
Important Notes:
* Brake Fluid: Brake fluid is corrosive and hydroscopic (absorbs moisture). If any spills, clean it immediately.
* Torque Specifications: Always use a torque wrench to tighten bolts and nuts to the correct specifications. Incorrect torque can damage the brakes.
* If you are uncomfortable doing this work, take your car to a qualified mechanic. Brake systems are critical for safety, and improper repair can have serious consequences.
Remember, a repair manual specific to your 1994 Mustang is invaluable for this job. The steps above are a general guide, and variations may exist depending on the specific model and options.
