2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 238Get this manual
end to avoid brake fluid spillageRemove Banjo bolt no9 and sealing washers no8 retaining brake hose no25 to master cylinder no28Discard sealing washersUnhook push rod yoke no33 from brake pedal no38Remove bolts no29 retaining master cylinder to frame Check: boots for crack springs for damage piston cups for wear, deterioration or damage
master cylinders and pistons for scoring, scratches or other damageChange part(s) if necessaryCheck locking pin no34 for excessive wear, replace if necessaryFront Master Cylinder: Coat master piston and piston cups with clean brake fluidInstall: spring onto master piston master piston into master cylinder snap ring into groove in the master cylinder boot into master cylinder and the groove in piston
Apply silicone grease to the brake lever contacting surface of the pistonV04K0AA