A brake caliper wind back tool is a specialized hand tool used to retract or spin back the piston in a brake caliper, especially for cars with rear brake calipers that have integral parking brakes. This tool allows the piston to be turned and pushed back into the caliper housing so new brake pads can be installed properly. It typically consists of a circular plate with two pins that fit into the grooved piston and a threaded rod with a handle to turn and push the piston back. The process of using this tool involves:
- Safely supporting the vehicle on jack stands and removing the wheel and caliper.
- Choosing the correct adapter plate that fits the piston.
- Installing the tool against the piston and tightening it to hold it in place.
- Turning the handle to spin the piston back into the caliper.
- Removing the tool once the piston is sufficiently retracted for new pads.
The piston in rear calipers often needs to be screwed back in (not just pressed), so the tool must wind the piston back while compressing it. If the piston won't move, it could be seized and may require caliper rebuilding or replacement. The tool is available in kits with multiple adapters for various piston sizes and vehicle models. This tool is an essential part of brake maintenance for many modern cars and is designed to prevent damage to the piston and seals during pad replacement. Basic versions are affordable and widely available, and some auto parts stores offer tool rentals.
For visual guidance, there are videos demonstrating how to use brake caliper wind back tools on different types of brake calipers.
