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The Shimano Diaphragm Unit Y1XK9801T is a specially designed spare part for high-quality brake levers from Shimano's XTR / XT / SLX series (BL-M9120, BL-M8100, BL-M7100, and BR-T-8100). The unit includes the diaphragm (transparent or black plastic) that is fitted inside the brake lever and ensures that the hydraulic brake system maintains proper pressure every time the brake is activated.
In cases where the diaphragm has suffered wear or deterioration (due to temperature, time, or use), replacing it with the Y1XK9801T restores the correct function, sealing, and performance required by modern riders. The product is small and lightweight (1 g), making it practical to keep in a spare maintenance kit.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.