Tools You'll Need:
* Jack and jack stands: Absolutely essential 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: You'll likely need metric sockets. Sizes will depend on your specific vehicle but commonly include 13mm, 14mm, and 15mm.
* Ratchet and extensions: To reach difficult areas.
* C-clamp or brake caliper compressor tool: This is crucial for compressing the caliper piston. A C-clamp can work, but a dedicated tool is safer and easier.
* Wrench to remove caliper bracket bolts (if applicable): This depends on your specific caliper design. Some calipers need the whole caliper bracket removed to replace pads, others just need the caliper to slide off.
* Pliers: For removing cotter pins (if present on caliper pins).
* Penetrating oil (like PB Blaster): Helps loosen rusty or seized bolts.
* Wire brush: To clean caliper surfaces.
* Brake cleaner: To clean brake components.
* New front brake pads: Make sure you get the correct pads for your 1997 GMC Jimmy.
* Gloves: Protect your hands from grease and dirt.
* Safety glasses: Protect your eyes from debris.
Procedure:
1. Safety First: Park the vehicle on a level surface, engage the parking brake, and chock the rear wheels. Use the jack to lift the front of the vehicle and securely place it on jack stands.
2. Remove the Wheel: Remove the lug nuts and carefully take off the wheel.
3. Locate the Caliper and Pads: Inspect the brake caliper, pads, and rotors. Note how everything is assembled – take pictures if you're unsure.
4. Compress the Caliper Piston: This is the most critical step. Use the C-clamp or caliper compressor tool to push the caliper piston back into the caliper. You'll need to rotate the piston while pushing to avoid damage. Brake fluid will likely be displaced, so have a rag handy. Important: Make sure the master cylinder brake fluid reservoir isn't overfilled. If it is, carefully remove some fluid.
5. Remove the Brake Pads: Depending on your caliper design, you may need to:
* Remove caliper mounting bolts (if applicable): Carefully remove the bolts holding the caliper to the bracket, supporting the caliper with your hand to prevent it from hanging by the brake line.
* Slide the caliper off: The caliper should now slide away from the rotor, freeing the brake pads.
* Remove the old pads: Gently remove the old pads, taking note of their orientation.
6. Clean the Caliper and Bracket: Use a wire brush to clean any rust or debris from the caliper bracket and the caliper piston. Clean everything with brake cleaner.
7. Install the New Brake Pads: Install the new brake pads, ensuring they are correctly oriented.
8. Reinstall the Caliper: Reinstall the caliper and tighten the mounting bolts to the specified torque (check your owner's manual or a repair manual).
9. Reinstall the Wheel: Carefully put the wheel back on and tighten the lug nuts.
10. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
11. Final Checks: Tighten the lug nuts fully. Pump the brake pedal several times to ensure the brakes engage properly. Check for leaks around the caliper.
12. Test Drive: Take a short test drive to verify that the brakes are working correctly.
Important Considerations:
* Brake Fluid: If you have to completely remove the caliper, you'll probably push more brake fluid back into the master cylinder. Be sure to check the fluid level regularly and top it up if necessary with the correct type of DOT-approved brake fluid.
* Rotor Condition: Inspect the brake rotors for wear. If they are grooved or excessively worn, they may need to be replaced or resurfaced.
* Repair Manual: A repair manual specific to your 1997 GMC Jimmy is highly recommended. It will provide detailed diagrams, torque specifications, and other crucial information.
This is a general guide. Specific procedures may vary slightly depending on your vehicle's exact configuration. Always consult a repair manual for your specific vehicle before starting any repair. If you're unsure about any step, it's best to have a qualified mechanic perform the work. Improper brake repair can be extremely dangerous.
