What was found
DFW - ON TAKEOFF FROM FRA, AIRPORT AUTHORITIES REPORTED FINDING PIECES OF TIRE RETREAD ON RUNWAY AFTER 7AT DEPARTED. AIRCRAFT NOTIFIED DFW APPROACH OF POSSIBLE BLOWN TIRE. EMERGENCY DECLARED LANDED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LEFT NUMBER 2 BRAKE ASSEMBLY HYDRAULIC LINE TORN AND DAMAGED. REPLACED LEFT NUMBER 2 BRAKE ASSEMBLY. SYSTEM GROUND CHECK NORMAL OPERATION.