Hydraulic Disc Brake Tool allow user to open piston by pushing the brake pads apart. The Barbieri brake piston retractor Art. TOL-00169 is designed to easily spread the brake pads and speed up maintenance and replacement of the pads. Durable aluminum structure with ergonomic handle. Wedge shape that helps push pistons back. It is practical and comfortable and does its job without risking damaging the pistons or the brake caliper. Makes brake-pad installation a breeze. Very handle to have in the tool box.