Tools You'll Need:
* Jack and jack stands (SAFETY FIRST: Never work under a car supported only by a jack.)
* Lug wrench
* Wheel chocks
* Socket wrench set (metric)
* Torque wrench
* C-clamp or brake caliper compression tool
* Pliers
* Wire brush
* Brake cleaner
* New brake pads
* New rotors (recommended, but not always strictly necessary)
* Penetrating oil (like PB Blaster)
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and use wheel chocks on the rear wheels.
2. Jack Up and Secure: Jack up the front of the car and securely place it on jack stands.
3. Remove Wheel: Remove the lug nuts and carefully take off the wheel.
4. Remove Caliper:
* Use a wire brush to clean away any rust or debris around the caliper mounting bolts.
* Apply penetrating oil to the caliper mounting bolts if they're stubborn.
* Unscrew the caliper mounting bolts and carefully remove the caliper. Be prepared for brake fluid to leak; have rags ready. You may need to support the caliper with a bungee cord or wire to prevent it from hanging by the brake line.
5. Compress Caliper Piston: Using a C-clamp or caliper compression tool, carefully compress the caliper piston. This is crucial to allow the new brake pads to fit. You may need to turn the piston to compress it evenly. Be cautious not to damage the piston.
6. Remove Old Brake Pads: The old brake pads should now be easily removable.
7. Inspect and Replace Rotors (Recommended): Inspect the brake rotors for scoring, wear, or excessive rust. If they're worn or damaged, replace them. If they're still in good condition, you can reuse them (but be aware that this will potentially shorten the life of your new pads).
8. Install New Brake Pads: Install the new brake pads into their respective slots in the caliper.
9. Reinstall Caliper: Carefully reinstall the caliper over the new brake pads, ensuring the caliper is correctly seated. Reinstall and tighten the caliper mounting bolts to the manufacturer's specified torque.
10. Reinstall Wheel: Reinstall the wheel and tighten the lug nuts. Do not overtighten.
11. Repeat for Other Side: Repeat steps 4-10 for the other front wheel.
12. Lower Vehicle: Carefully lower the vehicle from the jack stands.
13. Pump Brakes: Before driving, pump the brake pedal several times to ensure the brakes are functioning properly.
14. Test Drive: Take a short test drive to check brake performance. If you feel anything unusual, have your brakes inspected by a professional.
Important Considerations:
* Brake Fluid: You might need to bleed the brakes after replacing the pads, particularly if you've opened the brake line. This is a more advanced procedure and may require a second person. If you're unsure, get help from a professional.
* Torque Specifications: Always refer to your vehicle's repair manual for the correct torque specifications for the caliper bolts and lug nuts. Overtightening can damage components.
* Parts: Ensure you purchase the correct brake pads and rotors for your specific 2003 Pontiac Grand Prix model.
This is a simplified guide. Consult a repair manual specific to your car for detailed instructions and safety precautions. Remember that working on brakes is a safety-critical task. If you're not comfortable doing this yourself, it's always best to have a qualified mechanic do the work.
