Here's a general overview. Specific steps may vary slightly depending on the year and model of your Impala. Always consult your vehicle's repair manual for precise instructions and diagrams specific to your car.
Tools You'll Need:
* Jack and jack stands (essential for safety!)
* Wheel chocks
* Wrench to remove the wheel lug nuts
* Socket wrench and sockets (likely 13mm and 15mm for caliper bolts, but check your manual)
* C-clamp or caliper compression tool (to compress the caliper piston)
* Pliers or a brake pad spreader (optional, but helpful)
* Brake cleaner
* New brake pads (ensure you get the correct ones for your Impala's year and model)
* Gloves
* Safety glasses
General Steps:
1. Safety First: Park on a level surface, engage the parking brake, and use wheel chocks on the wheels opposite the one you're working on. Jack up the vehicle and securely support it with jack stands – never work under a car supported only by a jack.
2. Remove the Wheel: Remove the wheel lug nuts and carefully remove the wheel.
3. Expose the Caliper: You'll see the brake caliper clamped around the rotor.
4. Compress the Caliper Piston: This is crucial. Use a C-clamp or caliper compression tool to slowly and evenly compress the caliper piston. This creates space for the new, thicker brake pads. Be careful not to damage the piston or its boot. You may need to turn the piston as you compress it.
5. Remove the Brake Pads: Depending on your Impala's design, there may be retaining clips or pins holding the pads in place. Remove these to release the old brake pads.
6. Clean the Caliper and Slides: Thoroughly clean the caliper and its sliding pins with brake cleaner. Lightly lubricate the sliding pins with caliper grease (if applicable, check your manual).
7. Install the New Brake Pads: Carefully install the new brake pads into the caliper, ensuring they are properly seated.
8. Reinstall the Caliper: Carefully re-attach the caliper to the caliper bracket. Make sure it's properly aligned and the pins slide smoothly.
9. Reassemble: Replace the wheel, tighten the lug nuts to the manufacturer's specified torque (check your manual), and lower the vehicle.
10. Pump the Brakes: Before driving, pump the brake pedal several times to ensure the brakes engage properly.
11. Test Drive: Test drive the vehicle, and be cautious until you've ensured the brakes are functioning correctly.
Important Considerations:
* Rotor Inspection: While you have the wheel off, inspect the brake rotor for wear and tear. If it's excessively worn or scored, it needs to be replaced or resurfaced.
* Brake Fluid: While not directly involved in pad replacement, it's good practice to check your brake fluid level regularly. Low fluid levels can indicate a leak or worn pads.
* Torque Specifications: Always tighten lug nuts and caliper bolts to the manufacturer's specified torque. Over-tightening can damage the parts, while under-tightening can lead to loosening and failure.
Again, this is a general guide. Consult your Impala's repair manual for detailed, year-specific instructions and torque specifications. If you have any doubts about your ability to perform this repair safely and correctly, please take your vehicle to a qualified mechanic. Brake failure can be catastrophic.
