Safety First!
* Engage the parking brake firmly. This is crucial to prevent the vehicle from rolling.
* Use jack stands. Never work under a vehicle supported only by a jack.
* Wear safety glasses and gloves.
* Have a helper if possible.
Tools You'll Need:
* Jack and jack stands
* Lug wrench
* Wheel chocks
* Socket wrench set (metric)
* Ratchet and extensions
* Combination wrench set (metric)
* Brake caliper piston compression tool
* C-clamp (optional, alternative to piston compression tool)
* Wire brush
* Brake cleaner
* New brake pads
* New rotors (highly recommended)
* Torque wrench
* Penetrating lubricant (like PB Blaster)
Procedure:
1. Prepare the Vehicle: Park on a level surface, engage the parking brake, and chock the rear wheels.
2. Remove the Wheel: Loosen the lug nuts slightly with the lug wrench before jacking up the vehicle. Jack up the vehicle and securely place it on jack stands. Remove the lug nuts completely and take off the wheel.
3. Remove the Caliper:
* Use a combination wrench to remove the caliper mounting bolts. These are usually 14mm or 15mm. Sometimes they can be stubborn; use penetrating lubricant if needed.
* Carefully support the caliper with a bungee cord or wire to prevent it from hanging by the brake line. Don't let it dangle by the brake hose.
4. Remove the Brake Pads:
* The pads should now be visible. They're usually held in place by a retaining clip or pin. Remove these and take out the old brake pads.
5. Compress the Caliper Piston:
* This is crucial. Use the caliper piston compression tool to slowly and evenly compress the piston back into the caliper. If you don't have a tool, a C-clamp can work, but be careful not to damage the piston or caliper. Turn the piston slowly, applying pressure gradually.
6. Install New Rotors (Optional but Highly Recommended):
* If you're replacing the rotors, carefully remove the old rotors. They may be secured with bolts or simply press-fit onto the wheel hub. Clean the hub thoroughly before installing the new rotors.
7. Install New Brake Pads:
* Carefully install the new brake pads into their respective slots. Ensure they slide freely and make contact evenly with the rotor.
8. Reinstall the Caliper:
* Carefully reinstall the caliper onto its mounting bracket. Make sure the caliper slides smoothly on its pins. Torque the caliper mounting bolts to the manufacturer's specification.
9. Reinstall the Wheel:
* Install the wheel, tightening the lug nuts in a star pattern to ensure even pressure. Lower the vehicle.
10. Tighten Lug Nuts: Tighten the lug nuts to the manufacturer's specification using a torque wrench. This is critical to prevent wheel detachment.
11. Pump the Brakes: With the car on the ground, pump the brake pedal several times to ensure the brakes are functioning correctly.
12. Test Drive: Take a short test drive to ensure the brakes are working properly and there's no unusual noise or vibration.
Important Notes:
* Bleeding the Brakes: While unlikely to be necessary after a pad replacement, if you experience a spongy brake pedal after the job, you may need to bleed the brakes. This is a more advanced procedure requiring a helper and brake bleeding tools.
* Rotor Resurfacing: Instead of replacing the rotors, you can have them resurfaced at an auto parts store or machine shop if the wear isn't too excessive. However, replacing them is generally preferred for safety and better brake performance.
* Professional Help: If you're not comfortable with any part of this procedure, it's always best to seek professional help from a qualified mechanic. Improperly installed brakes can be extremely dangerous.
This guide provides a general overview. Always consult your vehicle's repair manual for specific instructions, torque specifications, and safety precautions. Remember, your safety is paramount. If you're unsure about any step, don't hesitate to seek professional assistance.
