Tools You'll Need:
* Jack and jack stands
* Lug wrench
* Wheel chocks
* Socket wrench set (metric)
* C-clamp (or brake caliper compressor tool)
* Pliers (for cotter pins, if applicable)
* Wire brush (to clean caliper surfaces)
* Brake cleaner
* New front brake pads
* Penetrating lubricant (like PB Blaster)
Steps:
1. Safety First: Park the Sonoma on a level surface, engage the parking brake, and chock the rear wheels. Jack up the front of the vehicle and securely place it on jack stands. Remove the wheel.
2. Inspect the Caliper: Look for signs of damage or leaks on the brake caliper. Note the position of the caliper and the brake hose.
3. Compress the Caliper Piston: This is crucial. The new pads are thicker than the old ones, so you need to create space in the caliper. You can use a C-clamp to carefully compress the piston back into the caliper. Important: Make sure the piston goes back in smoothly. If it's difficult, penetrating lubricant may help, but a problem may exist that requires professional attention. Be careful not to damage the piston seal. Also, some pistons rotate as they're compressed.
4. Remove the Brake Pads: Usually, there are pins or clips holding the brake pad retaining clips in place. Remove these using the appropriate tools (likely pliers or a small wrench). Then, carefully remove the old brake pads. Inspect them for wear. If the rotors are significantly worn or grooved, they will likely also need replacement.
5. Clean the Caliper: Use a wire brush to clean any rust or debris from the caliper surfaces where the pads slide. Clean the caliper piston thoroughly with brake cleaner.
6. Install the New Brake Pads: Carefully insert the new brake pads into the caliper. Make sure they slide freely.
7. Reassemble: Reinstall the retaining clips and pins.
8. Reinstall the Wheel: Carefully lower the vehicle and reinstall the wheel. Tighten the lug nuts in a star pattern.
9. Pump the Brakes: Get back in your vehicle and firmly pump the brake pedal several times to engage the new pads. Check for any leaks or unusual noises.
10. Test Drive: Carefully test drive the vehicle, checking for proper braking performance.
Important Considerations:
* Rotor Inspection: While you have the wheels off, carefully inspect the brake rotors for wear and scoring. If they're worn excessively or damaged, they need to be replaced or resurfaced.
* Caliper Slides: The caliper slides should move freely. If they're stiff or seized, they may need lubrication or replacement.
* Brake Fluid: While unlikely, if you have to replace the calipers, you may lose some brake fluid. If that happens, you should have the system bled.
* Torque Specifications: Consult your owner's manual or a repair manual for the correct torque specifications for the wheel lug nuts. Over-tightening can damage the wheel studs.
* Professional Help: If you're uncomfortable performing this repair yourself, take your Sonoma to a qualified mechanic. Brake system maintenance is critical for safety.
This is a general guide. Always refer to a repair manual specific to your 2000 GMC Sonoma for detailed instructions and torque specifications. Improper brake repair can be dangerous. If you are unsure about any step, seek professional assistance.
