What was found
(CAN) AT ROTATION RECEIVED THE BRAKE OVERHEAT WARNING. MESSAGE WENT AWAY AND CAME BACK INTERMITTENTLY OVER THE COURSE OF A COUPLE MINUTES. RAN QRH. RETURNED TO FIELD. ON TAXI IN RECEIVED BRAKE OVERHEAT WARNING WITH NUMBERS RANGING FROM 20 TO 2. NUMBERS JUMPING FROM HIGH TO LOW CONTINUOUSLY. CORRECTIVE ACTION: FOUND THE #4 BRAKE TEMP SENSOR CONNECTOR LOOSE. REMOVED AND REPLACED #4 BRAKE TEMP SENSOR AND SECURED THE CONNECTOR (TC# 20190625021)