1985 Honda Odyssey 350 FL350R Shop Manual, Page 155Get this manual
BRAKES WHEEL CYLINDER INSPECTION
CAUTION
(1) PISTON
Clean all parts thoroughly with the clean brake fluid Blowout all passages with compressed airInspect the wheel cylinder and piston sliding surfaces for scores, grooves, or other damageReplace the piston c'ups whenever the wheel cylinder is disassembledMeasure the wheel cylinder 1.0,(2) CUPS
SERVICE LIMIT: 17.513 mm (0.6895 in)