Here's a general outline. Always consult your vehicle's repair manual for the precise procedure and safety precautions specific to your year and model Sierra. The steps may vary slightly depending on trim level and options.
Steps (general, consult your manual for specifics):
1. Safety First: Engage the parking brake. Chock the front wheels securely. Jack up the rear of the truck and securely support it with jack stands. Remove the rear wheels.
2. Locate the Adjuster: Inside the drum, you'll find a star-wheel adjuster. This is a small, toothed wheel that controls the distance between the brake shoes and the drum. You'll likely need a small screwdriver or a special adjuster tool (available at auto parts stores) to reach and turn it.
3. Adjust the Brake: Turn the adjuster clockwise to tighten the brake shoes. Do this in small increments. After each adjustment, turn the wheel by hand to feel the resistance. You want enough resistance to prevent the wheel from turning easily, but not so much that it's difficult to turn. This is crucial – over-tightening can severely damage the brakes.
4. Check for Proper Adjustment: The wheel should turn freely when the parking brake is released but should be held firmly when the parking brake is engaged. A good test is to try to turn the wheel by hand with the parking brake applied; there should be significant resistance, but the wheel shouldn't be completely locked.
5. Reassembly: Once the adjustment is correct, reinstall the wheels and lower the vehicle. Test the parking brake. If the parking brake still doesn't hold properly or if the rear brakes drag, you may have a more serious problem and professional help will be needed.
Important Considerations:
* Wear and Tear: If you're having to adjust the parking brake frequently, the brake shoes or drums may be worn and need replacement.
* Professional Help: If you're uncomfortable with this process, take your truck to a qualified mechanic. Improper adjustment can lead to brake failure, a very dangerous situation.
* Repair Manual: The service manual for your 2000 GMC Sierra will have detailed diagrams and instructions specific to your vehicle. This is the best resource for accurate steps.
This information is for guidance only and does not replace professional advice. Always prioritize safety when working on your vehicle's brakes.
