Important Note: Before you begin, engage the parking brake firmly. This is crucial for safety.
Method 1: Single Piston Caliper (Most Likely)
1. Compress the piston using a caliper compression tool: This is the safest and easiest method. These tools are inexpensive and readily available at most auto parts stores. They're designed to compress the piston evenly and avoid damage to the seals. Simply insert the tool into the piston opening and slowly crank it until the piston is fully retracted.
2. If you don't have a tool: You *might* be able to use a large C-clamp, but this is risky. If you try this method, place a large block of wood between the caliper and the clamp jaws to distribute the pressure evenly across the piston's surface. Proceed with extreme caution; uneven pressure can damage the caliper.
3. Rotation: Some single-piston rear calipers on this model require rotating the piston *inward* while compressing. This is crucial to allow the piston to retract into the caliper. Try to feel for the direction of rotation as you compress the piston. If it doesn't seem to compress linearly, try rotating gently while applying pressure.
Method 2: Dual Piston Caliper (Less Likely but Possible)
Dual piston calipers are less common on rear brakes, but if yours has one, you'll need a different approach. You almost certainly need a caliper compression tool for this; trying to do it manually is highly discouraged.
1. Identify the pistons: Dual piston calipers have two pistons – typically one on the inside and one on the outside.
2. Use the appropriate tool: A dedicated dual-piston caliper compression tool is essential here. These tools often have two arms to compress each piston simultaneously and evenly.
3. Follow the tool's instructions: Each tool is slightly different, so carefully follow the manufacturer's instructions to avoid damaging the caliper.
Regardless of the caliper type:
* Cleanliness is crucial: Keep the area clean and free of debris. Use brake cleaner to remove any dirt or grime before starting.
* New brake lubricant: Apply a small amount of high-temperature brake lubricant to the caliper pins and slider pins (if applicable) after completing the repair to ensure smooth caliper operation.
* Consult a repair manual: A repair manual specific to your 2007 Ford Five Hundred will provide detailed instructions and diagrams for your exact model. This is the best source for accurate and safe procedures.
If you're uncomfortable performing this repair yourself, take your vehicle to a qualified mechanic. Improperly retracting the piston can damage the caliper, leading to brake failure. Brake safety is paramount.
