2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 279Get this manual
HYDRAULIC DISC BRAKE
Remove the a-ring Clean the seal grooves, ca liper cylinder and piston with clean brake fluid
INSPECTION
Remove the boot and shaft from the parking brake base Check the shaft and base threads for wear or damageCheck the boot for wear, deterioration or damageBOOT