1981-1984 Official Honda ATC250R Shop Manual, Page 140Get this manual
BRAKE MECHANISM (FRONT DISC BRAKE)
ATC 2S0R
Install the pad springs, shims and padsInstall the cali per on the fork legInstall the brake hose and tighten the brake hose boltAfter the front brake has been installed, bleed air from the system (Page 11-2)
MASTER CYLINDER
BRAKE MASTER CYLINDER
MASTER CYLINDER REMOVAL
Remove the brake lever and brake hoseTie the hose to the handlebar to keep brake fluid from drainingRemove the master cylinder from the handlebar