2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 391Get this manual
FRONT AND REAR BRAKES 2 3
1Check: brake caliper pistons Scratchesrustwear Replace the brake caliper assembly brake caliper cylinders Wearscratches Replace the brake caliper assembly brake caliper body Cracksdamage Replace brake fluid delivery passage (brake caliper body) Blockage Blow out with compressed airWARNING Replace the caliper piston seals and dust seals whenever the brake caliper is disassembled