What was found
CREW GOT A BRAKE TEMP OVER HEAT MESSAGE. THE CREW RAN THE QRH AND DECIDED TO DIVERT TO THE NEAREST SUITABLE AIRPORT. THE PLANE LANDED IN KATL SAFELY WHILE DECLARING AN EMERGENCY AS A PRECAUTION. 5533 WAS ABLE TO TAXI TO A GATE UNDER THEIR OWN POWER. AT THIS TIME THERE ARE NO FURTHER ISSUES. DEFERRED RH OB BTMS. R/R #4 BRAKE TEMP SENSOR IAW CRJ 900 AMM 32-46-01-000/400-801. OPS CHECK GOOD. NO DEFECTS NOTED. THIS CLEARS MEL.