However, if you're determined to do it yourself, here's a general overview. Remember, this is a simplified guide and you should consult a repair manual specific to your 1988 GMC Jimmy for detailed instructions, torque specifications, and diagrams. Your manual will also specify the correct parts for your particular vehicle.
General Steps (This is not exhaustive and may not apply to your specific situation):
1. Safety First: Engage the parking brake firmly. Use jack stands to securely lift the vehicle. Never work under a vehicle supported only by a jack. Wear safety glasses and gloves.
2. Diagnosis: Determine which part of the braking system needs repair. This may involve checking for leaks, worn pads or shoes, damaged rotors or drums, or issues with the master cylinder, calipers, wheel cylinders, or lines. You may need to bleed the brakes afterward, depending on the repair.
3. Wheel Removal: Remove the wheel and tire from the affected side(s).
4. Brake Caliper (Disc Brakes):
* Inspection: Inspect the brake pads for wear. Replace if necessary. Check the caliper for leaks or damage. Inspect the caliper pistons for free movement.
* Pad Replacement: Remove the caliper, compress the pistons (using a specialized tool to avoid damage), and install the new pads. Reinstall the caliper.
* Caliper Repair/Replacement: If the caliper is damaged or leaking, it may need to be rebuilt or replaced.
5. Wheel Cylinder (Drum Brakes):
* Inspection: Inspect the brake shoes for wear. Replace if necessary. Check the wheel cylinder for leaks.
* Shoe Replacement: Remove the brake drum, inspect and replace the shoes. Check and replace the wheel cylinder if leaking.
6. Brake Lines and Hoses: Inspect brake lines and hoses for leaks, cracks, or damage. Replace any damaged components.
7. Master Cylinder: Inspect the master cylinder for leaks or low fluid. If necessary, it will need to be replaced or rebuilt (a complex job).
8. Bleeding the Brakes: After any repair involving opening the brake system, you'll need to bleed the brakes to remove air from the lines. This requires two people – one to pump the brake pedal and one to open and close the bleeder valves on each caliper or wheel cylinder. Bleeding is done in a specific order, usually starting with the furthest wheel from the master cylinder.
9. Testing: After completing the repairs, test the brakes thoroughly in a safe, controlled environment before driving the vehicle.
Specific Tools You Might Need:
* Jack and jack stands
* Lug wrench
* Socket set and wrenches
* Brake caliper piston compression tool
* C-clamp (possibly)
* Brake bleeder wrench
* Brake fluid
* New brake pads or shoes
* New rotors or drums (if needed)
* New calipers or wheel cylinders (if needed)
* New brake lines or hoses (if needed)
* Repair manual specific to your 1988 GMC Jimmy
Again, this is a general overview and is not a substitute for a detailed repair manual and the expertise of a qualified mechanic. Brake repair is critical for your safety and should not be taken lightly. If you're unsure about any step, consult a professional.
