Here's a general outline. Specific steps may vary slightly depending on your truck's exact configuration. Always consult a repair manual specific to your 2000 GMC Sonoma for detailed instructions and torque specifications.
Tools You'll Need:
* Jack and jack stands: Absolutely essential for safety. Never work under a vehicle supported only by a jack.
* Wheel chocks: To prevent the vehicle from rolling.
* Lug wrench: To remove the wheels.
* Socket wrench set: With various sizes, including metric.
* C-clamp or caliper compression tool: To compress the caliper piston.
* Brake caliper piston wind-back tool (optional but recommended): Helps prevent damage to the caliper's seals.
* Wrench for caliper mounting bolts: Usually a 13mm or 14mm.
* Wrench for caliper bracket bolts: Size varies depending on the truck.
* Screwdriver (possibly Phillips and flathead): For pad retaining clips.
* Wire brush: To clean the caliper bracket and rotor mating surfaces.
* Brake cleaner: To clean brake parts.
* New front brake pads and rotors: Ensure you get the correct parts for your specific Sonoma model.
* Penetrating lubricant (like PB Blaster): To help loosen rusty bolts.
* Gloves: Protect your hands.
* Safety glasses: Protect your eyes.
Procedure:
1. Safety First: Park on a level surface, engage the parking brake, and chock the rear wheels. Jack up the front of the truck and securely support it on jack stands.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Remove the Caliper:
* Locate the caliper mounting bolts. Apply penetrating lubricant if needed and let it sit for a few minutes.
* Carefully loosen and remove the caliper bolts.
* Carefully remove the caliper. You may need to support the caliper with a wire or bungee cord to prevent it from hanging by the brake line.
4. Compress the Caliper Piston:
* Use a C-clamp or caliper compression tool to carefully push the caliper piston back into the caliper bore. This creates space for the new, thicker brake pads. Be careful not to damage the piston or seals. A wind-back tool is highly recommended to avoid damaging the seals.
5. Remove the Old Brake Pads: Usually, there are clips or pins holding the pads in place. Remove these and take out the old brake pads.
6. Clean the Caliper and Bracket: Use a wire brush and brake cleaner to thoroughly clean the caliper bracket, sliding surfaces and rotor mating surface.
7. Install New Brake Pads: Insert the new brake pads into the caliper. Ensure they are seated properly.
8. Install the Caliper: Reinstall the caliper onto the bracket, securing it with the mounting bolts. Tighten to the manufacturer's specified torque.
9. Remove the Old Rotor: Usually, you'll need to remove the caliper bracket bolts to remove the old rotor. The rotor may be held on by just friction. If it's difficult to remove, tap it gently with a rubber mallet. Clean the rotor mounting surface on the wheel hub thoroughly.
10. Install the New Rotor: Carefully place the new rotor onto the wheel hub studs. Ensure it's seated correctly.
11. Reinstall the Caliper Bracket (if removed): Reinstall the caliper bracket bolts, tightening them to the manufacturer's specified torque.
12. Reinstall the Wheel: Put the wheel back on and tighten the lug nuts. Don't fully tighten them yet.
13. Lower the Vehicle: Carefully lower the vehicle to the ground.
14. Torque Lug Nuts: Tighten the lug nuts to the manufacturer's specified torque using a torque wrench.
15. Pump the Brakes: Get back in your vehicle and pump the brake pedal several times to ensure the new pads are making contact with the rotors.
16. Test Drive: Take a short test drive to ensure the brakes are working properly. Check for any unusual noises or vibrations. If you hear grinding, you may have installed the pads incorrectly or there might be other issues.
Important Notes:
* Torque Specifications: Refer to your repair manual for the correct torque specifications for all bolts. Over-tightening can damage parts.
* Bleeding Brakes: In some cases, you may need to bleed the brakes after replacing the pads and rotors to remove any air bubbles that might have entered the brake lines. This usually isn't necessary unless you've worked directly on the brake lines.
* Professional Assistance: If you are not comfortable performing this repair, take your vehicle to a qualified mechanic. Brake system failure can be extremely dangerous.
This is a simplified guide. Always consult a repair manual specific to your 2000 GMC Sonoma for detailed instructions and safety precautions. Remember safety first!
