What was found
(CAN) DURING POST FLIGHT INSPECTION ON ACFT CREW NOTICED THAT THE RT OTBD BRAKE CALIPER CASTING WAS BROKEN. MAINTENANCE WAS NOTIFIED AND UPON INVESTIGATION FOUND 1 OF THE GUIDE PINS WAS MISSING, PN 069-02000. THE BOLT THAT HOLDS PIN IN PLACE WAS STILL LOCK WIRED TO HOUSING. BRAKE CYLINDER HOUSING HAD BROKEN CASTING AT TOP MOUNTING BOLT FOR LINING BACK PLATE. TIME ON UNIT WAS UNKNOWN AS PART IS ON CONDITION. FORWARD AND AFT BRAKE ASSY REPLACED ALONG WITH TORQUE PLATE AND LININGS.