Park Tool PP-1.2

Using a screwdriver or other metal tools can easily chip, scratch, or crack the ceramic or metal pistons found in modern hydraulic calipers. The PP-1.2 is made from a material that won't damage the piston surface, ensuring you don't compromise the seal or braking performance.

The PP-1.2 is designed to fit the vast majority of mountain and urban hydraulic calipers. Its wedge shape is specifically engineered to slide between the pads or directly against the pistons to push them back evenly.

You can use the PP-1.2 with the brake pads still installed, which is often the quickest way to reset the pistons before sliding a new wheel in. However, if you are replacing the pads entirely, it is often easier to use the tool directly on the pistons once the old pads are removed.

The tool is designed to reset the pistons to their fully retracted position, which is standard practice for pad changes. As long as you are pushing them back to be flush with the caliper body, you are within the intended operating range and won't damage the seals.

The PP-1.2 is very low maintenance. Just wipe it clean of any brake fluid or road grime after use to ensure the surface remains smooth and doesn't introduce contaminants into your brake system.