Here's a breakdown of the process, but this is *not* a substitute for a proper repair manual specific to your 2003 Nissan Pathfinder/Aztec. Always consult your vehicle's repair manual for precise instructions and torque specifications.
Tools You'll Need:
* Jack and jack stands: Absolutely crucial for safety. Never work under a vehicle supported only by a jack.
* Lug wrench: To remove the wheels.
* Wheel chocks: To prevent the vehicle from rolling.
* Socket wrench set (metric): Various sizes will be needed.
* Wrench set (metric): For caliper bolts and possibly other components.
* C-clamp or brake caliper compressor: To compress the caliper piston.
* Brake cleaner: To clean brake parts.
* New brake pads: Make sure you get the correct pads for your vehicle's model.
* New rotors (likely): Rotors often need replacing when you replace pads. Inspect them carefully; if they're scored or excessively worn, they must be replaced.
* Gloves: Protect your hands from grease and dirt.
* Safety glasses: Protect your eyes from flying debris.
* Penetrating oil (like PB Blaster): Can help loosen stubborn bolts.
* Torque wrench: Essential for tightening bolts to the correct specification, preventing damage.
Steps (General Outline – Consult Your Repair Manual for Specifics):
1. Safety First: Park on a level surface, engage the parking brake, and use wheel chocks on the wheels that remain on the ground. Use the jack to lift the vehicle and securely place it on jack stands.
2. Remove the Wheel: Loosen the lug nuts before jacking up the vehicle. Then, remove the wheel.
3. Inspect the Brake System: Assess the condition of the brake pads, rotors, and caliper.
4. Remove the Caliper: There will be bolts securing the caliper to the caliper bracket. Use the appropriate wrench to remove these. You might need to use penetrating oil if they're stuck.
5. Compress the Caliper Piston: Use a C-clamp or caliper compressor to push the piston back into the caliper. This creates space for the new, thicker brake pads. Be careful not to damage the piston.
6. Remove the Old Brake Pads: The old pads should slide out easily.
7. Install the New Brake Pads: Slide the new pads into place.
8. Install the Caliper: Reinstall the caliper onto the caliper bracket, tightening the bolts to the correct torque specification (found in your repair manual).
9. Install the Rotor (if necessary): If you're replacing the rotor, remove the old one and install the new one. Ensure it's properly seated.
10. Replace the Wheel: Install the wheel and tighten the lug nuts.
11. Lower the Vehicle: Carefully lower the vehicle using the jack. Once the vehicle is on the ground, tighten the lug nuts firmly.
12. Repeat for Other Wheels: Repeat steps 2-11 for each wheel that needs new brakes.
13. Pump the Brakes: Before driving, pump the brake pedal several times to ensure the brakes are functioning correctly.
14. Test Drive: Take a short test drive to ensure the brakes are working properly.
Important Considerations:
* Brake fluid: You might need to bleed the brakes if you've opened the brake system (e.g., if you replaced any brake lines or components beyond the pads and rotors). Bleeding is a separate process requiring a helper and a brake bleeder kit.
* ABS: If your vehicle has an Anti-lock Braking System (ABS), there may be additional steps involved. Consult your repair manual for specific instructions.
* Professional Help: If you're not comfortable with any part of this process, take your vehicle to a qualified mechanic. Improperly installed brakes can be extremely dangerous.
This is a simplified overview. Always refer to a repair manual specific to your 2003 Nissan Pathfinder/Aztec before attempting this repair. Improper brake installation can lead to serious injury or death.
