Tools You'll Need:
* Jack and jack stands: Absolutely crucial 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 set and ratchet: You'll need various sizes, likely including 13mm, 15mm, and possibly others depending on your specific model.
* C-clamp or brake caliper compression tool: To compress the caliper piston.
* Pliers: Possibly needed to remove brake pad retaining clips.
* Wrench for caliper mounting bolts: This is usually a 13mm or 14mm, but verify yours.
* Penetrating lubricant (like PB Blaster): Helps loosen rusted bolts.
* Gloves: To keep your hands clean.
* Safety glasses: To protect your eyes.
* New brake pads: Make sure you buy the correct pads for your specific 1999 Jeep Grand Cherokee model (some have different caliper types).
* Optional: Wire brush: To clean caliper surfaces.
* Optional: Brake cleaner: To clean caliper surfaces.
Procedure:
1. Safety First: Park on a level surface, engage the parking brake, and chock the rear wheels.
2. Jack Up and Secure: Safely jack up the front of the vehicle and securely place it on jack stands.
3. Remove Wheel: Remove the lug nuts and carefully take off the wheel.
4. Inspect the Brake System: Before doing anything, visually inspect the brake rotors, calipers, and brake lines for any obvious damage or leaks.
5. Expose Brake Pads: You will need to remove the caliper mounting bolts. Apply penetrating lubricant if needed and let it sit for a few minutes. Once removed, carefully support the caliper with a wire or bungee cord to prevent it from hanging by the brake line. Do not let the brake line hang freely. The pads should now be visible.
6. Compress Caliper Piston: Using the C-clamp or compression tool, carefully compress the caliper piston. This makes room for the new, thicker pads. This process may require some effort. You might need to turn the piston slowly to allow it to retract properly. If it doesn't retract easily, there may be some internal brake system issues that require professional help.
7. Remove Old Brake Pads: The old brake pads are usually held in place by retaining pins or clips. Remove these and take out the old pads.
8. Clean and Inspect: Clean the caliper surfaces and the brake rotor with a wire brush and brake cleaner (if using). Inspect the rotor for wear. If it is severely grooved or worn, it will need to be replaced or resurfaced.
9. Install New Brake Pads: Install the new brake pads, ensuring they slide easily into place. Make sure the wear indicators are facing outwards. Replace any retaining clips.
10. Reinstall Caliper: Carefully reinstall the caliper onto the bracket, ensuring the mounting bolts are securely tightened.
11. Reinstall Wheel: Carefully replace the wheel and tighten the lug nuts in a star pattern.
12. Lower Vehicle: Lower the vehicle from the jack stands.
13. Test Brakes: Pump the brake pedal several times to build up pressure. Test the brakes carefully and gently at low speeds before driving at normal speeds. If there is anything wrong (spongy brake pedal, etc), there is an issue and you must stop driving until it's resolved.
Important Considerations:
* Brake fluid: If the brake fluid reservoir gets low, you may need to top it off with fresh DOT 3 brake fluid.
* Rotor resurfacing or replacement: Assess rotor condition. If worn, they may need resurfacing (by a machine shop) or replacement.
* Caliper rebuild: If the caliper pistons are sticking or corroded, a caliper rebuild kit might be necessary.
This is a general guide. Specific steps and bolt sizes may vary slightly depending on your Jeep Grand Cherokee's exact trim level and configuration. Always refer to a repair manual specific to your vehicle for detailed instructions and torque specifications. Improperly installed brakes are dangerous. If you have any doubts, consult a qualified mechanic.
