What’s in the box: 1 brake lever piston rod plus 2 spare rubber rings — everything needed for a clean, quick replacement of the lever piston assembly. Exact compatibility: Designed specifically for Shimano M785, M8000 and M7000 brake systems to ensure a seamless fit and consistent braking feel without modification. Lightweight, functional design: The piston rod weighs 5 g and includes weight-reduction holes to minimize added mass at the lever. That reduces rotating and lever weight while maintaining the actuator function. Reliable performance: Engineered for consistent operation under normal riding and braking conditions. The included spare rubber rings make it simple to reseal and restore lever action after service. Why you need it: Replace a worn or damaged piston rod to restore proper lever return and braking modulation; carry a spare for roadside repairs; or use during routine maintenance to replace aging parts and keep brakes responsive. Use cases / applications: 1. Routine maintenance — replace the piston rod and seals during a brake service to eliminate play and maintain consistent lever feel. 2. On-trail repair — swap a damaged piston rod quickly using the included spare rubber rings to get back to riding the same day. 3. Lightweight component refresh — install as part of a lever rebuild to reduce rotating mass at the lever while retaining OEM compatibility. Specifications at a glance: Package contents: 1 piston rod, 2 spare rubber rings Compatibility: Shimano M785 / M8000 / M7000 brake systems Weight: 5 g Feature: Weight-reduction holes for reduced mass and improved responsiveness Clear, compatible replacement intended to restore lever function without guesswork.