Scenario 1: Single-piston calipers (most likely)
Most likely, your 1996 Buick Regal has rear calipers with a single piston. These are usually relatively straightforward to compress. You'll need:
* C-clamp or caliper compression tool: A C-clamp will work for many, but a purpose-built caliper compression tool is safer and easier to use, especially if the piston is recessed deeply. Avoid using anything that could damage the piston's surface.
* Shop rags or paper towels: To protect the piston and surrounding areas from scratches.
* Penetrating lubricant (optional): If the piston is stuck, apply a penetrating lubricant like PB Blaster to help it move more freely. Allow ample time for it to penetrate.
* Appropriate size socket (optional): Some single-piston calipers have a square or other shaped recess for a socket to fit for better piston engagement.
Procedure:
1. Secure the caliper: Use a bungee cord or wire to suspend the caliper from something so it doesn't hang by the brake line. This is important to prevent damage to the brake line.
2. Clean the piston: Clean the piston and surrounding area with a clean rag.
3. Protect the piston: Place a rag or thick piece of cardboard between the C-clamp and the piston to protect its surface from damage.
4. Compress the piston: Slowly and evenly compress the piston using the C-clamp or compression tool. Use consistent pressure. If the piston doesn't move easily, use the penetrating lubricant.
5. Check for smooth operation: As you compress the piston, ensure it's moving evenly and freely. If you encounter resistance, stop and investigate. A seized piston might require further attention or professional help.
6. Repeat for each caliper: Repeat this process for both rear calipers.
Scenario 2: Dual-piston calipers (less likely, but possible)
Some models might have dual-piston rear calipers. These require a different approach. One piston usually rotates, and the other compresses more like a single piston. You'll need:
* Caliper compression tool: A universal type of caliper piston compressor tool is essential for this. A C-clamp is unsuitable.
* Shop rags or paper towels: To protect the pistons.
* Penetrating lubricant (optional): If pistons are stuck.
Procedure (Dual-piston):
1. Follow steps 1 and 2 from the single-piston procedure
2. Use the correct tool: Use the appropriate caliper compression tool, engaging the tool correctly with each piston. It's crucial to use the correct tool to avoid damage. Some tools will have adaptors to deal with various styles of pistons.
3. Compress the pistons: Compress both pistons simultaneously or sequentially according to the design of your caliper.
4. Repeat for each caliper: Repeat for both rear calipers.
Important Considerations:
* Consult a repair manual: A repair manual specific to your 1996 Buick Regal will provide the most accurate and detailed instructions for your vehicle's brake system.
* Safety: Brake work can be dangerous. If you're not comfortable working on your brakes, take your vehicle to a qualified mechanic.
* Bleeding the brakes: After replacing the pads, you MUST bleed the brakes to remove any air introduced into the brake lines. This is crucial for proper braking function and safety.
If you have any doubt, always seek professional help. Improperly working brakes are a serious safety hazard.
