1986-1987 Honda Fortrax TRX70 Service Manual, Page 125Get this manual
REAR WHEEL BRAKEDRIVE MECHANISM INSPECTION Measure the brake lining thickness
SERVICE LIMIT: 2.0 mm (0.08 Inl
Replace the brake 'inings as set if either lining is thinner than
the service 'imitNOTE
Contaminated brake linings reduce stopping powerKeep oil or grease off the 'inings
Inspect the brake drum for wear or damageReplace if necessaryMeasure the brake drum I.D