However, if you're determined to do it yourself, here's a general overview. This is not a complete, step-by-step guide, and variations may exist depending on the specific Malibu model. Always consult a repair manual specific to your 2003 Chevy Malibu for detailed instructions and diagrams.
Tools you'll likely need:
* Repair Manual: Absolutely essential for detailed instructions and torque specifications.
* Socket set (metric): Various sizes.
* Wrench set (metric): Various sizes.
* Brake fluid catch container: To collect the old brake fluid.
* New brake fluid: DOT 3 or DOT 4, as specified in your owner's manual.
* Vacuum pump: To bleed the brakes after the booster is installed.
* Bleeder wrenches: For bleeding the brakes.
* Screwdrivers (Phillips and flathead): Various sizes.
* Safety glasses: Protect your eyes.
* Gloves: To keep your hands clean.
* Torque wrench: Crucial for tightening bolts to the correct specification.
* Possibly a brake booster alignment tool: Some boosters require precise alignment during installation.
General Steps (Consult your repair manual for precise details):
1. Disconnect the battery: This is crucial for safety.
2. Release brake system pressure: This is critical to avoid injury. Consult your repair manual on the safest method for your specific vehicle.
3. Drain the brake master cylinder: Carefully siphon out as much brake fluid as possible from the master cylinder using a turkey baster or similar tool.
4. Remove the brake lines: Carefully disconnect the brake lines from the master cylinder. Have your catch container ready.
5. Remove the master cylinder: This is usually held in place by bolts and may require disconnecting a few more lines or components.
6. Remove the brake booster: This usually involves disconnecting vacuum lines, possibly electrical connectors, and removing mounting bolts.
7. Install the new brake booster: Carefully reverse the removal process. Make sure to properly align the booster.
8. Install the master cylinder: Make sure all connections are tight and secure.
9. Reconnect brake lines: Bleed any air that may have entered the system.
10. Reconnect vacuum lines and electrical connectors: Double-check everything.
11. Bleed the brakes: This is absolutely crucial to remove any air from the braking system. Follow the proper bleeding procedure for your vehicle (usually starting with the furthest wheel from the master cylinder).
12. Check for leaks: Carefully inspect all connections and fittings for any leaks.
13. Reconnect the battery: Test the brakes thoroughly before driving.
Warnings:
* Brake fluid is corrosive: Avoid skin contact.
* Never work on the braking system without proper safety precautions.
* Incorrect installation can lead to brake failure and serious injury or death.
* If you have any doubts, consult a professional mechanic.
This is a simplified overview. Always refer to a repair manual specific to your 2003 Chevy Malibu for detailed instructions and safety precautions. The exact procedure may vary slightly depending on the model and trim level of your vehicle. A poorly executed repair could result in catastrophic brake failure. Safety should be your top priority.
