1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 182Get this manual
HYDRAULIC DISC BRAKES Install new pads in the caliperAlign the pad pin bolt hole by depressing the pads againstthe caliper, and install th pad pin bolt
Push th caliper pistons in all th way, being careful not to damage the pads
CAUTION
Be careful that the master cylinder does not overjlow when the
caliperpistons are compressed Brakejluid can cause damage to painted, plastic, or rubber surfaces
Install the caliper to the knuckle so that the disc is positioned between the pads, being careful not to damage the padsMake sure that the guide plate and brake hose are installed in the position shownTighten the caliper mounting bolts