2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 423Get this manual

HYDRAULIC BRAKE Remove the caliper pin boltPivot the caliper body up and remove it from the bracketRemove the brake padsCALIPER BODY CALIPER BRACKET

Remove the pad spring and caliper piston
PAD SPRING
Be careful not to Push the dust and piston seals in and lift them outdamage the piston sliding surface

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