Here's a general procedure. Specifics may vary slightly depending on whether you have rear drum brakes or rear disc brakes. The instructions below assume rear drum brakes, as that's the more common scenario requiring wheel cylinder replacement on a 95 Lumina. If you have disc brakes in the rear, the process is significantly different and involves calipers, not wheel cylinders.
Tools You'll Likely Need:
* Wheel chocks: Essential for safety.
* Lug wrench: To remove the wheels.
* Jack and jack stands: To safely lift the vehicle.
* Socket set and wrench set: Various sizes will likely be needed.
* C-clamp or brake cylinder compressor: To compress the wheel cylinder pistons. This is crucial to prevent damage.
* Brake cleaner: To clean brake components.
* Rags or shop towels: To absorb brake fluid.
* New wheel cylinders: Get the correct replacements for your vehicle.
* Possibly a screwdriver: May be needed to pry away dust shields.
* Optional: Fluid catcher: To minimize brake fluid spills.
Procedure (Rear Drum Brakes):
1. Safety First: Chock the front wheels, engage the parking brake, and safely lift the rear of the vehicle using a jack and jack stands.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Expose the Wheel Cylinder: You'll likely need to remove the brake drum. This sometimes requires a gentle tap with a hammer and a soft-faced mallet or a drum puller. Once the drum is removed, you'll see the wheel cylinder.
4. Remove the Brake Lines: Carefully loosen the brake lines using the correct wrench size. Have a rag ready to catch the escaping brake fluid. Be sure to not damage the lines. You may need a flare nut wrench for a better grip. Some people like to use a short length of hose to plug the lines to minimize fluid loss.
5. Compress the Wheel Cylinder Pistons: Using the C-clamp or brake cylinder compressor, carefully compress the wheel cylinder pistons. This will allow you to remove the wheel cylinder without damage.
6. Remove the Wheel Cylinder: Once the pistons are compressed, the wheel cylinder should slide out of its mounting location. There might be retaining clips or small bolts holding it; carefully remove those.
7. Clean Up: Clean the area thoroughly with brake cleaner.
8. Install the New Wheel Cylinder: Install the new wheel cylinder, ensuring it sits correctly in its mounting location. Reinstall any retaining clips or bolts.
9. Reconnect the Brake Lines: Carefully reconnect the brake lines, tightening them to the proper torque specification (consult your repair manual).
10. Reinstall the Brake Drum: Carefully reinstall the brake drum.
11. Reassemble: Reinstall the wheel and lower the vehicle.
12. Bleed the Brakes: After installing new wheel cylinders, you must bleed the brakes to remove air from the brake lines. This is important for proper braking function. Follow the bleeding procedure outlined in your repair manual; it usually involves opening bleeder valves at each wheel while an assistant pumps the brake pedal.
Important Considerations:
* Repair Manual: A repair manual specific to your 1995 Chevy Lumina is highly recommended. It will provide detailed diagrams, torque specifications, and other crucial information.
* Brake Fluid: Use the correct type of brake fluid (DOT 3 or DOT 4, check your owner's manual).
* Professional Help: If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Brake work is critical for safety.
This is a general overview. Always consult a repair manual for your specific vehicle model for detailed instructions and torque specifications. Improper brake repair can be extremely dangerous. If you have any doubts, seek professional assistance.
