SRAM Guide T Disc Brake and Lever - Rear, Hydraulic, Post Mount, Black, A1Guide T brings consistent performance and reliable stopping power thanks to a revised lever design and lightweight four piston caliper. Featuring SRAM's Directlink lever, updated master cylinder and timing port closure, all combined to provide a more positive braking system. Bleeding Edge, drip free bleed port closure and adaptor to minimize fluid loss Heat Shield technology to reduce caliper fluid temperature and prevent loss of braking power