2004 Polaris Pro X Factory Service Manual, Page 266Get this manual
BRAKES 5Clean housing bore with alcoholInspect bore for scratches, dents, cuts, or digs that might cause leakReplace housing if severe damage is found
6Paint housing bore and cartridge o-rings with D.O.T3 brake fluidPolaris DOT Brake Fluid PN 2870990
7Align slots in cartridge with tabs in housing bore and insert cartridgePush cartridge through until outlet end of cartridge snaps into place