The unique, wedge-shaped Park Tools PP-1.2 Hydraulic Brake Piston Press slides into a hydraulic disc brake caliper to preset the piston when replacing pads, aligning pads, and performing other service procedures. Makes hydraulic disc brake maintenance and repair faster and easier. Park Tools PP-1.2 Hydraulic Brake Piston Press Features The unique shape and size of the PP-1.2 is perfect for compressing the hydraulic piston by pushing the brake pads apart to speed service and pad replacement Updated shape to better fit 2011 and later Shimano XTR callipers Slide the polished, wedge shaped tool between pads to expand the gap and pre-set the pistons into the calliper Useful if you have accidently pulled the brake lever without your wheel and brake disc in the bike Reset the pistons without disassembling the calliper or removing the brake pads