Tools you'll need:
* Jack and jack stands: Absolutely essential for safety.
* Lug wrench: To remove the wheels.
* Wheel chocks: To prevent the vehicle from rolling.
* Socket set and wrenches: Various sizes will be needed, including those to remove the caliper mounting bolts, and potentially the parking brake cable bracket. Consult your repair manual for specifics.
* C-clamp or caliper compression tool: To compress the brake caliper piston.
* Brake cleaner: To clean the brake components.
* Torque wrench: Essential for properly tightening bolts to prevent damage and ensure safe operation. Consult your repair manual for torque specifications.
* New rear brake rotors: Make sure you get the correct ones for your Grand Cherokee.
* Penetrating oil (PB Blaster, etc.): Helpful for loosening stubborn bolts.
* Safety glasses and gloves: Protect yourself from injury.
* Repair manual: Highly recommended for specific details and torque specifications for your vehicle. A Haynes or Chilton manual is a good investment.
Procedure:
1. Safety First: Park on a level surface, engage the parking brake, and chock the front wheels. Raise the rear of the vehicle using the jack and securely support it with jack stands.
2. Remove the Wheel: Remove the lug nuts and carefully take off the wheel.
3. Remove the Caliper:
* Locate the caliper mounting bolts. They are usually on the back of the caliper.
* Apply penetrating oil to the bolts if they are rusty or difficult to turn.
* Use the appropriate socket and wrench to remove the bolts.
* Carefully support the caliper with a bungee cord or wire to prevent it from dangling and damaging the brake line. Do not let the brake line hang.
4. Compress the Caliper Piston: Using a C-clamp or caliper compression tool, slowly compress the brake caliper piston. This will give you enough clearance to remove the rotor. You may need to turn the piston several times to fully retract it.
5. Remove the Parking Brake Cable Bracket (If Necessary): Some models require removing the parking brake cable bracket to get the rotor off. Consult your repair manual.
6. Remove the Rotor: Often, the rotor simply slides off. However, it might be slightly stuck due to rust. A gentle tap with a rubber mallet might be necessary. Avoid damaging the rotor's surface.
7. Install the New Rotor: Slide the new rotor onto the wheel studs. Make sure it slides on easily and fits snugly.
8. Reinstall the Parking Brake Cable Bracket (If Necessary): If you removed it, reinstall the parking brake cable bracket.
9. Reinstall the Caliper: Carefully mount the caliper back onto its mounting brackets. Install and tighten the caliper mounting bolts to the specified torque.
10. Reinstall the Wheel: Mount the wheel and tighten the lug nuts. Don't overtighten them yet.
11. Lower the Vehicle: Carefully lower the vehicle using the jack.
12. Torque the Lug Nuts: Use the torque wrench to tighten the lug nuts to the manufacturer's specification. Refer to your owner's manual or repair manual.
13. Pump the Brakes: Pump the brake pedal several times to restore brake pressure.
14. Check for Leaks: Inspect the brake system for any leaks.
15. Test Drive: Take a short test drive to check for proper braking performance. If anything feels amiss, immediately stop and have a mechanic inspect the brakes.
Important Considerations:
* Repair Manual: A repair manual specific to your 1999 Jeep Grand Cherokee is highly recommended. It provides detailed instructions, torque specifications, and diagrams specific to your vehicle.
* Brake System Bleeding: If you have to remove the brake line, you will likely need to bleed the brakes afterward. This is a crucial step to remove air bubbles from the brake lines.
* Professional Help: If you're not comfortable performing this repair, it's best to take your vehicle to a qualified mechanic. Brake repairs are critical for safety.
This is a general guide. Consult your repair manual for the specific procedures and torque specifications for your Jeep Grand Cherokee. Always prioritize safety and consult a professional if unsure about any step.
