However, if you're determined to do it yourself, here's a general outline. This is NOT a comprehensive guide and should be supplemented with a repair manual specific to your year and model Sunfire. Repair manuals are available online and at auto parts stores. They provide crucial details and diagrams you'll need.
Tools You'll Likely Need:
* Wheel chocks: Essential for safety.
* Jack and jack stands: Securely support the vehicle.
* Lug wrench: To remove the wheel.
* Socket set and wrenches: Various sizes will be needed.
* Brake cylinder compressor: This tool is crucial to compress the piston and prevent fluid loss.
* C-clamp or similar: Might be needed depending on your cylinder compressor.
* New wheel cylinders: Buy the correct ones for your Sunfire.
* Brake fluid: DOT 3 or DOT 4, as specified in your owner's manual.
* Clean rags or shop towels: To clean up brake fluid spills.
* Safety glasses and gloves: Protect yourself.
* Wire brush: To clean rust and debris.
* Pry bar (possibly): To help separate parts.
General Steps (Consult your repair manual for specifics!):
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels.
2. Remove the Wheel: Loosen the lug nuts before jacking up the car. Remove the wheel.
3. Remove the Brake Drum: This can sometimes be difficult. You may need to gently tap it with a hammer and pry bar (wood block between the bar and drum is recommended to avoid damage). Sometimes, the drum can be seized due to rust; penetrating oil may help.
4. Inspect the Brake Shoes: Check their condition; they might need replacing at the same time.
5. Remove the Wheel Cylinder: This usually involves removing retaining clips or bolts, and then carefully pulling the cylinder out. Be prepared for brake fluid to leak.
6. Compress the Wheel Cylinder: Using your brake cylinder compressor, compress the piston to prevent fluid loss and to make cylinder removal easier.
7. Install the New Wheel Cylinder: Carefully install the new cylinder, ensuring it's properly seated.
8. Reassemble: Reinstall the brake shoes (if necessary, adjust them properly), brake drum, wheel, and lug nuts.
9. Bleed the Brakes: This is CRITICAL. Air in the brake lines can lead to brake failure. You'll need to bleed the brakes at each wheel to remove air bubbles. Use a helper to pump the brake pedal while you open the bleeder valves one at a time.
10. Test the Brakes: After bleeding, carefully test the brakes, making sure they function properly before driving.
Important Considerations:
* Brake Fluid is Corrosive: Clean up any spills immediately.
* Proper Bleeding is Crucial: Air in the brake lines is extremely dangerous.
* Use the Right Parts: Make sure you get the correct wheel cylinders for your Sunfire's year and model.
* Consult Your Repair Manual: This is a simplified overview. Your repair manual provides detailed instructions and diagrams specific to your vehicle.
This process can be challenging, even for experienced mechanics. If you are not comfortable with any of the steps, please take your vehicle to a qualified professional. Your safety and the safety of others depends on it.
