2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 332Get this manual
BRAKE SYSTEM Put back the caliperInstall and tighten the brake caliper bolt to the specified torqueTORQUE: 23 Nm (2.3 kgfm, 17 lbfft) Install the front wheel (page 14-12)CALIPER
BRAKE DISC INSPECTION
Remove the front wheel (page 14-12)Visually inspect the brake disc for damage or cracksMeasure the brake disc thickness at several pointsSERVICE LIMIT: 3.0 mm (0.12 in)
Replace the brake disc if the smallest measurement is less than the service limit (page 14-16)