Important Note: Before you begin, consult a repair manual specific to your 1992 Buick Regal. This will provide the most accurate information and diagrams for your specific vehicle. Improperly compressing the pistons can damage the caliper.
There are typically two main methods:
Method 1: C-Clamp and Block of Wood (Most Common)
1. Prepare the caliper: Remove the brake pads. You'll likely need a C-clamp, a piece of wood (to distribute pressure evenly and protect the piston), and possibly some rags to clean up brake fluid spills.
2. Position the C-clamp: Carefully place the C-clamp on the caliper, positioning the wood block between the C-clamp's jaw and the piston. Ensure the wood block is large enough to spread the clamping pressure evenly across the piston surface.
3. Compress the piston: Slowly and steadily tighten the C-clamp. The piston will retract into the caliper. Go slowly to avoid damaging the piston seal or blowing out the brake fluid. You may need to stop and wipe away any brake fluid that leaks out. Brake fluid is corrosive, so clean any spills immediately.
4. Check for leaks: Once the piston is fully retracted, carefully inspect the caliper for leaks.
Method 2: Using a Brake Caliper Piston Compression Tool
This is generally the safer and preferred method, especially if you're unfamiliar with the process. These tools are available at most auto parts stores. They are specifically designed to compress brake pistons safely and evenly. Follow the manufacturer's instructions that come with the tool.
Critical Considerations:
* Brake Fluid: Be prepared for brake fluid to leak out. Have rags or absorbent material ready. Brake fluid is corrosive; wear gloves and eye protection.
* Direction: The piston will usually only compress in one direction. Observe how the piston moves as you start compressing to avoid forcing it the wrong way.
* Caliper Condition: If the caliper is damaged or seized, you may need to replace it rather than trying to force the pistons.
* Self-Adjusting Mechanisms: Remember that the rear calipers on many vehicles are self-adjusting. Sometimes merely installing new pads is sufficient; forcing the pistons can be unnecessary and even harmful. Refer to your repair manual to confirm how your caliper adjusts.
If you are uncomfortable performing this task yourself, it's highly recommended to take your vehicle to a qualified mechanic. Improperly compressing the pistons can lead to brake failure, which is extremely dangerous.
