1986-1987 Honda Fortrax TRX70 Service Manual, Page 131Get this manual
REAR WHEELBRAKEDRIVE MECHANISM After '86: Install the brake arm aligning the punch marks on the cam and
the armTighten the brake arm bolt and nut to the specified torque
TORQUE: 7-12 Nm 10.71.2 kg-m, 5-9 ft-Ib)
Install the adjustersNOTE
Make sure the rear brake lever and pedal have the proper amount of free play (pages11 ,12)