1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 197Get this manual
REAR WHEEL BRAKE DRIVE MECHANISM
REAR BRAKE
Remove the right rear wheel (page 133)Remove the brake drum nuts, brake drum cOlier and drum (pages 13-9 and 13- 10),
BRAKE LINING INSPECTION
Measure the brake lining thickness,
SERVICE LIMIT: mm (0.1 in)