2004-2005 Honda TRX450R Factory Sevice Manual, Page 282Get this manual
HYDRAULIC BRAKE BRAKE DISC INSPECTION For front brake discremove the ront wheel (page 13-10)Visually inspect the brake disc fo da mage crack Measure the brake disc thickness at several pointsSERVICE LIMITS: Fron2.5 mm (O.l Oin) Rear: 3.5 mm (O14 in )
Repl ace the brake dis if the smallest measurement is less han service lim it
Check he rake di sc fo wa rpage
SERVICE LIMIT: 0.30 mm lO.012 in )
Check he fr ont hee hub bea rings or rear axle bearings excess ive play, if the warpage excee ds he serv ice limitRepl ace th brak isc jf th bearings are no rmal