1981-1984 Official Honda ATC250R Shop Manual, Page 138Get this manual

1981-1984 Official Honda ATC250R Shop Manual, Page 138

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r::iJ HONDA BRAKE MECHANISM (FRONT DISC BRAKE)
Check the piston for scoring, scratches or other damageMeasure the caliper piston ODSERVICE LIMIT: 30.140 mm (1.1866 in)

BRAKE FLUID