What was found
FLT 667 BUF-MCO, CREW DECLARED EMERGENCY DUE TO BRAKE HOT ECAM AT 35000FT, PG SHOWED BRAKE NR 2 FLUCTUATING BETWEEN 310-450. INITALLY TEMP APPEARED TO COME DOWN BELOW 300 MOMENTARILY THEN STARTED TO RISE SPORADICALLY TILL READING 750-850 AND STAYED THERE UNTIL CREW WERE ABLE TO PERFORM THE ECAM ACTION OF LOWERING THE GEAR, BRAKE TEMP CAME STEADILY AND STAYED WITHIN NORMAL RANGE 60-80 FOR THE REST OF THE FLIGHT BRAKE NR 1 STAYED 65-70 THROUGHTOUT AND GOT COOLER LATER IN FLIGHT (BRAKE TEMPERATURE MONITORING UNIT). REMOVED AND REPLACED NR 2 BRAKE ASSY IAW AMM 32-42-27. OPS CHECK OK.