Tools You'll Need:
* Jack and jack stands
* Lug wrench
* Wheel chocks
* Socket wrench and sockets (various sizes, likely including 15mm, 13mm, and possibly others)
* Ratchet and extensions
* C-clamp (or caliper compression tool)
* Brake cleaner
* Penetrating oil (like PB Blaster)
* Wire brush or sandpaper
* New rear brake pads
* Anti-seize lubricant (optional, but recommended)
* Torque wrench (highly recommended)
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and chock the front wheels. Use the jack to lift the rear of the car and securely place it on jack stands. Never work under a car supported only by a jack.
2. Remove the Wheel: Remove the lug nuts using the lug wrench. Carefully pull the wheel off the hub.
3. Expose the Caliper: You should now see the brake caliper assembly. Depending on the Impala model and if you've never replaced the pads before, there might be some rust present around the caliper bolts. Apply penetrating oil to these bolts and let it sit for a few minutes to help loosen them.
4. Remove the Caliper: Locate the caliper mounting bolts (usually two). Use the appropriate socket and ratchet to remove them. The caliper might be a little heavy, so support it as you remove the bolts. You may need to use a second pair of hands or simply carefully hold the caliper up to prevent it from hanging by the brake line. Once the bolts are removed, carefully lift the caliper off the rotor.
5. Compress the Piston: The brake caliper piston needs to be compressed to make room for the new, thicker brake pads. Use a C-clamp (carefully positioned to avoid scratching the piston) or a specialized caliper compression tool to push the piston back into the caliper. Important: Ensure you are compressing the piston in a straight manner to avoid damaging the piston seal. You might need to twist the piston occasionally as you're compressing it.
6. Remove Old Pads: The old brake pads should now be easily removed. You may need to slightly pry them off.
7. Clean the Caliper and Slides: Clean the caliper slides and the caliper mounting brackets with a wire brush or sandpaper to remove any rust or debris. Apply a small amount of anti-seize lubricant to the slides to ensure smooth movement.
8. Install New Pads: Install the new brake pads into their respective slots in the caliper. Make sure they slide in smoothly.
9. Reinstall the Caliper: Carefully reattach the caliper to the caliper bracket using the mounting bolts. Tighten them to the manufacturer's specified torque (check your owner's manual).
10. Reinstall the Wheel: Put the wheel back on and tighten the lug nuts.
11. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
12. Tighten Lug Nuts: After lowering the vehicle, give the lug nuts a final tightening using the lug wrench.
13. Test the Brakes: Pump the brake pedal several times to ensure the brakes are working properly. Take the car for a short test drive to check for any unusual noises or vibrations.
Important Considerations:
* Rotor Inspection: While you have the wheel off, inspect the brake rotor for excessive wear or damage. If the rotor is significantly worn or damaged, it should be replaced.
* Brake Fluid: Compressing the piston pushes brake fluid back into the master cylinder. Check your brake fluid level and top it off if needed. If you notice any signs of leaks or damage, consider having a professional inspect the brake system.
* Professional Help: If you are uncomfortable with any of these steps, it's always best to take your car to a qualified mechanic. Brake repair is critical for safety.
This guide provides a general overview. Specific details may vary depending on your particular 2003 Chevy Impala model. Always consult your owner's manual and refer to a repair manual specific to your vehicle for detailed instructions and torque specifications. Improper brake repair can be dangerous.
