2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 240Get this manual
Loosen wheel nutsRaise vehicle and support it securelyRemove wheel(s)Remove Banjo bolt no9 with sealing washers no8 and detach brake hose from caliperCatch spilled fluid with ragAttach the brake hose in position to prevent the fluid from flowing outUnscrew bolts no21 retaining caliper to knuckle and remove caliper Clean piston grooves, caliper cylinder and piston with clean brake fluidClean slide pins with brake cleaner and rag
If boots no18 are deteriorated or hard, replace with new onesCheck caliper cylinder for scratches, rust or other damagesIf so, replace caliperCheck piston for scratches, rust or other damagesIf so, replace pistonCoat piston seal with clean brake fluid and install it into piston grooves in caliper
Coat piston with clean brake fluid and install into cylinder with the closing toward caliper bodyApply silicone grease into sliding bores and install slide pins