2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 430Get this manual
BRAKE SYSTEM Remov th aster pisto n, primary cup and sp rin Clean the aster cy linde r, spring and master iston in cl ean brake fl uid
MASTER PISTON
PRIMARY CU P
INSPECTION
Check th pis to cups and boot lo ear, de teriora-
tion dam ageCheck the sp ring lo da mage MASTER PISTON