Tools You'll Need:
* Jack and jack stands: Safety first! 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 set and wrenches: Various sizes, likely including metric.
* C-clamp or caliper compression tool: To compress the brake piston.
* Brake cleaner: To clean brake parts.
* New brake caliper: Ensure you get the correct one for your specific Grand Cherokee model (there are variations).
* New brake pads (likely): You'll probably need new pads at the same time.
* Penetrating oil (like PB Blaster): To help loosen rusted bolts.
* Torque wrench: To tighten bolts to the correct specification.
* Gloves and safety glasses: Essential for protection.
Procedure:
1. Safety First: Park on a level surface, engage the parking brake, chock the front wheels, and use jack stands to securely lift the rear of the vehicle.
2. Remove the Wheel: Remove the lug nuts and carefully take off the wheel.
3. Remove the Caliper:
* Locate the caliper mounting bolts: These are usually on the back of the caliper.
* Apply penetrating oil: Spray penetrating oil on the bolts to help loosen them if they're stuck. Let it sit for a few minutes.
* Unscrew the bolts: Use the appropriate socket and wrench to carefully remove the bolts.
* Carefully remove the caliper: Support the caliper as you remove it to avoid stressing the brake line. The caliper might be heavy and contains brake fluid. Try to keep it level to prevent spilling fluid.
4. Compress the Brake Piston:
* Use a C-clamp or caliper compression tool: Slowly compress the piston back into the caliper. This is necessary to allow you to install the new brake pads. Go slowly to avoid damaging the piston seal. You may need to turn the piston to compress evenly.
5. Remove the Old Brake Pads: Carefully remove the old brake pads from the caliper. Inspect the caliper slides and clean them. If they're stiff, you may need to lubricate them (use a caliper slide lubricant, not grease).
6. Install the New Brake Pads: Carefully install the new brake pads into the caliper.
7. Install the New Caliper:
* Mount the new caliper onto the caliper bracket: Make sure it's properly seated and aligned.
* Tighten the caliper mounting bolts: Use the appropriate torque specification from your vehicle's repair manual.
8. Bleed the Brakes (Crucial): Air in the brake lines can severely compromise braking performance. You'll need to bleed the brakes after installing the new caliper. This usually involves opening the bleeder valve on the caliper while an assistant pumps the brake pedal. Consult your repair manual for the proper bleeding procedure. A pressure bleeder is recommended for easier bleeding.
9. Reinstall the Wheel: Put the wheel back on and tighten the lug nuts. Do not fully tighten them yet.
10. Lower the Vehicle: Carefully lower the vehicle to the ground.
11. Final Tightening: Fully tighten the lug nuts using a lug wrench in a star pattern.
12. Test the Brakes: Carefully test the brakes several times. Ensure the brake pedal feels firm. If the pedal feels spongy, you'll likely need to bleed the brakes again.
Important Considerations:
* Brake Fluid: Brake fluid is corrosive and can damage paint. Clean up any spills immediately.
* Proper Torque: Use a torque wrench to tighten all bolts to the manufacturer's specifications.
* Brake Bleeding: This step is critical; incorrect bleeding can result in very poor braking.
* ABS: If your Grand Cherokee has an anti-lock braking system (ABS), you may need a specialized scanner to fully bleed the system.
This is a simplified guide. Always refer to your vehicle's repair manual for detailed instructions and torque specifications. If you're unsure about any part of this process, seek professional help from a qualified mechanic. Brake failure can have serious consequences.
