Restore rear braking performance with this rear brake master cylinder rebuild kit. Designed for select Sportsman ATVs, this all-inclusive kit includes a new piston/shaft, three cupped seals, washer, and return spring for reliable braking function. Replaces OE part numbers 1910790, 1910301, and 1911113. Fits the following models: 1999–01 Diesel 1999–00 Sportsman 335 2001–05 Sportsman 400 2006–07 Sportsman 450 1998–09 Sportsman 500 2003–05 Sportsman 600 2002–07 Sportsman 700 2005–06 Sportsman 800 1999–01 Worker 335/500