2003 Polaris Deep Snow Snowmobiles Service Manual, Page 293Get this manual
BRAKESFINAL DRIVE Replacing Cartridge Subassembly Cont
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 fluid
Polaris DOT Brake Fluid PN 2870990