Here's a general outline. Specifics might vary slightly depending on the exact trim and configuration of your van (1500, 2500, etc.). Always consult a repair manual specific to your van's year and model for detailed instructions and diagrams.
Tools You'll Need:
* Jack and jack stands (Safety first! Never work under a vehicle supported only by a jack.)
* Wheel chocks
* Lug wrench
* Socket wrench set (metric)
* Wrenches (metric)
* Pliers
* Screwdrivers (possibly Phillips and flathead)
* Brake shoe spring compressor tool (essential for easy and safe compression of the return springs)
* Wire brush
* Brake cleaner
* New brake shoes (including hardware like springs, clips, and adjuster parts – get a kit)
* Grease (for lubrication of pins and other parts)
* Safety glasses
* Gloves
Steps (General Outline):
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Jack up the van and securely support it on jack stands.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Remove the Drum: Locate the brake drum. It's usually held on by the wheel studs. Sometimes it can be stubborn; a few gentle taps with a rubber mallet might help. If it's seized, you may need to use penetrating oil and carefully work it loose. Be careful not to damage the drum.
4. Inspect Components: Once the drum is off, thoroughly inspect the brake shoes, wheel cylinder, and other components. Look for wear, corrosion, leaks, or damage. Replace anything that's worn or damaged. Clean everything thoroughly with brake cleaner.
5. Remove the Old Brake Shoes: This is where the spring compressor tool becomes crucial. The springs holding the shoes in place are under considerable tension. Using the compressor, carefully release the tension on the springs and remove the old shoes. Note how the springs, clips, and adjuster mechanisms are arranged – you'll need to reassemble them identically. Take pictures if needed.
6. Install the New Brake Shoes: Lubricate the contact points (as specified in your repair manual) with the appropriate grease. Install the new shoes, making sure everything aligns correctly with the wheel cylinder. Use the spring compressor to compress the springs and install them securely. Ensure the adjuster mechanism works properly.
7. Adjust the Brake Shoes: Carefully adjust the brake shoes so they make even contact with the drum. This is crucial for proper braking.
8. Reinstall the Drum: Carefully put the drum back on, ensuring it slides easily.
9. Reassemble: Reinstall the wheel, lug nuts, and lower the van.
10. Test the Brakes: Before driving, pump the brake pedal several times to ensure the brakes engage properly. Test the brakes carefully at low speed in a safe area. If anything feels wrong, immediately stop and have a mechanic check the work.
Important Considerations:
* Wheel Cylinder: Inspect the wheel cylinder carefully. Leaks indicate it needs replacement; this is a more complicated repair and usually requires bleeding the brake lines.
* Brake Lines: If any brake lines are damaged, they must be replaced immediately.
* Bleeding Brakes: After any brake work involving the wheel cylinder or lines, you'll likely need to bleed the brakes to remove air from the lines. This is also a procedure requiring some mechanical knowledge.
Again, this is a simplified overview. Consult a repair manual specific to your 1999 Chevy Express van. Improper brake repair can lead to serious injury or death. If you lack experience, it's best to have a professional mechanic handle this task.
