1987-2009 Yamaha ATV YFM350X Warrior Raptor Service Manual, Page 193Get this manual
REAR BRAKE AWARNING
-Cover piston with rag and use extreme caution when expelling piston from cylinder-Never attempt to pry out piston
Caliper piston removal steps: elnsert the rag G) into the caliper to lock the pistone Blow compressed air (2) into the hose joint opening to force out the piston from the caliper body