1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 277Get this manual
BRAKE SYSTEM Remove tile brake drum oover Remove th brake drum
Measur,e the brake drum 1.0SERVICE UMIT: 161.0 mm (6.34 in)
Inspect th,e brake drum for scoring, cracks and out of roundness
Check the brake drum cover dust seal for wear or DUST SEAL damageDrive it ut of the drum cover jf necessaryFor the insta llation of the dust sealsee page 14-22