What’s included: One hydraulic brake piston, prepped and ready to install into your bicycle’s hydraulic brake caliper for a fast, straightforward replacement. Key dimensions: 22 mm x 8.7 mm piston size — confirm fit against these measurements before installation to ensure correct seating and function. Function and benefit: Replacing a worn or damaged piston restores proper caliper operation, improves braking consistency, and reduces the risk of leaks or uneven pad wear. This piston is intended to help maintain reliable stopping power under normal and demanding riding conditions. Performance highlights: Designed to support improved heat dissipation and provide steady piston movement for more consistent braking feel during repeated stops or sustained descents. Compatibility: Specifically suitable for the following model groups — M6000; M675 / M7000 / M7100; M785 / M8000 / M8100; M9020 / M9000 / M9100 — and compatible with R7070, R8070, R9170, RS785, RS80 and related caliper configurations. Verify compatibility with your caliper model before purchasing. Why you need this: Over time pistons can corrode, score, or stick from contamination and wear. A direct-fit replacement piston restores caliper sealing and piston travel, helping prevent brake fade, uneven pad contact, and fluid leakage. Easy installation: Supplied ready for installation — ideal for experienced home mechanics and professional technicians familiar with hydraulic brake servicing. Follow manufacturer service procedures and bleed the brake system after replacing the piston. Practical applications / use scenarios: 1. Replace a corroded or scored piston after regular riding in wet or muddy conditions to restore smooth piston retraction and consistent pad engagement. 2. Service high-mileage road or gravel bikes before an upcoming multi-hour ride or long descent to reduce heat-related braking inconsistencies. 3. Swap in a new piston during a caliper rebuild on MTB or road bikes to eliminate sticking pistons and avoid uneven pad wear. Suitability: Appropriate for road, gravel, and mountain bike configurations that use the listed caliper groups. Intended as a component-level replacement — ensure seals, pads, and fluid are checked and serviced as needed. Notes and safety: Confirm the piston dimensions (22 mm x 8.7 mm) and listed model compatibility before ordering. Use correct tools and follow brake manufacturer service instructions for installation, lubrication, and system bleeding.