1989 Honda FL400R Pilot Service Manual, Page 194Get this manual

BRAKES Measure the brake lining thickness
SERVICE LIMIT: 2.0 mm (0.08 in)
Inspect the brake lining for crackingglazingwear or contaminationReplace the brake shoes if the lining thickness is less than the
service limit
Check the springs for damage
Remove the tensioner pins, shoe clampssprings and brake

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