2007-2009 Honda TRX300EX TRX300X service manual, Page 298Get this manual
HYDRAULIC DISC BRAKE Loosen the lock nut and remove the adjusting bolt and brake armDisconnect the parking brake cable from the brake arm and remove it from the cable holder
Remove the two bolts and parking brake baseRemove the O-ring
When removing the oil boltcover the end of the hose to prevent contamination