Here's a general guide. Always consult your owner's manual for specific instructions and diagrams for your vehicle. Variations exist between models.
Tools You'll Likely Need:
* Socket wrench set (including the right size for the lug nuts and the adjuster)
* Screwdriver (possibly a flathead and a Phillips)
* Wheel chocks
* Jack and jack stands (essential for safety)
* Possibly a brake drum adjuster tool (some specialized tools make this easier)
Procedure (General Steps - Consult Your Manual):
1. Safety First: Park on a level surface, engage the parking brake, chock the front wheels, and use a jack and jack stands to safely lift the rear of the vehicle. Never work under a vehicle supported only by a jack.
2. Remove the Wheel: Remove the lug nuts and carefully take off the wheel.
3. Access the Adjuster: The adjuster mechanism is usually located on the back of the brake drum. You might need to remove the dust cap or a small inspection plate to see it. The adjuster is typically a star wheel or a similar mechanism with notches.
4. Locate the Adjuster: This is the most crucial step and varies by vehicle. The adjuster might be accessible through a hole in the backplate, or might require removing the brake shoes first. Refer to a repair manual or online diagrams specific to your 2004 Chevrolet Aveo. Sometimes a small hole allows you to insert a screwdriver into the adjuster, turning it.
5. Adjust the Brakes: Turn the adjuster clockwise to tighten the brake shoes against the drum. Do this very gradually. You should feel resistance as the adjuster tightens. Turn it only a small amount at a time (maybe a 1/8th of a turn). Then, spin the drum. It should rotate freely with slight resistance. If it's too tight, turn the adjuster counter-clockwise to loosen it. The goal is to have a small amount of drag on the drum without binding.
6. Test the Adjustment: Spin the drum by hand. It should rotate freely but with a slight drag. If it's hard to turn or it's binding, you've over-tightened. If it spins freely with no resistance, you need to tighten it more.
7. Reassemble: Once the adjustment is correct, replace the dust cap (if removed), put the wheel back on, and tighten the lug nuts to the manufacturer's specified torque.
8. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
9. Test Drive: Test the brakes immediately in a safe location. If the brakes feel weak or pull to one side, the adjustment is likely incorrect. Recheck and readjust.
Important Notes:
* Consult a Repair Manual: This is crucial. A Haynes or Chilton manual will have detailed diagrams and instructions specific to your vehicle.
* Brake Shoes: If the brake shoes are worn out, adjusting the brakes won't solve the problem. You'll need to replace them. Worn shoes are usually indicated by very little brake pad material remaining on the shoe.
* Professional Help: If you are unsure about any step, take your car to a qualified mechanic. Brake work is critical for safety.
This is a simplified guide. Improper adjustment can damage your brakes. Always prioritize safety and consult your vehicle's repair manual before attempting this repair.
