Assuming you meant a standard 1979 Chevy Suburban (around 1-2 tons), here's a general overview of how to change drum brakes. However, this is *not* a substitute for a proper repair manual specific to your vehicle's year and model:
Before you begin:
* Consult a repair manual: This is crucial. A Haynes or Chilton manual will provide detailed, vehicle-specific instructions and diagrams. Failing to do so could lead to mistakes and damage.
* Safety first: Use jack stands to securely support the vehicle. Never work under a vehicle supported only by a jack. Wear safety glasses.
* Gather tools: You'll need a wheel wrench, jack, jack stands, socket set (various sizes), wrenches (various sizes), a brake drum spreader, a C-clamp (possibly), wire brush, brake cleaner, new brake shoes, wheel cylinders, and possibly new hardware (springs, clips, etc.).
General steps (again, consult your repair manual for precise details):
1. Secure the vehicle: Safely jack up the vehicle and place it on jack stands.
2. Remove the wheel: Remove the lug nuts and take off the wheel.
3. Remove the drum: Sometimes the drum can be removed by hand; others require a drum puller. Be prepared for some resistance due to the brake shoes being pressed against the drum.
4. Inspect the components: Examine the brake shoes, wheel cylinders, springs, and other hardware for wear and tear.
5. Remove the brake shoes: Carefully remove the brake shoes, paying attention to the way the springs and other components are arranged. Take pictures if necessary.
6. Inspect and replace the wheel cylinders: Check for leaks or damage. Wheel cylinders are usually replaced when doing brake work to avoid future problems.
7. Clean everything thoroughly: Use a wire brush and brake cleaner to clean all the brake components.
8. Install new brake shoes: Install the new brake shoes, making sure everything is properly aligned and secured with the springs and other hardware. Refer to your repair manual for precise placement.
9. Install the wheel cylinder(s): Install the new wheel cylinders, making sure to lubricate the seals appropriately.
10. Reinstall the drum: Carefully put the brake drum back on.
11. Reinstall the wheel: Reinstall the wheel and tighten the lug nuts.
12. Bleed the brakes: This is VERY important. Air in the brake lines can significantly impair braking performance. You'll need a brake bleeder kit and a helper to pump the brake pedal.
13. Test the brakes: Carefully test the brakes in a safe area. If they feel spongy or the pedal goes to the floor, there's likely still air in the system.
Important notes:
* Professional help: If you are uncomfortable performing this repair, take your vehicle to a qualified mechanic. Brake failure can be extremely dangerous.
* Proper disposal: Dispose of old brake components properly. Brake fluid and brake dust are hazardous.
* Lubrication: Use only brake-compatible lubricants.
Again, this is a general outline. You absolutely must consult a repair manual specific to your vehicle before attempting this repair. The process can vary significantly between models and years. Improper brake repair can be dangerous and lead to serious injury or death.
