What was found
DURING FLIGHT PARKING EMERGENCY BRAKE LIGHT CAME ON INTERMITTENTLY WITH THE PARK BRAKE NOT RELEASED MESSAGE COMING ON INTERMITTENTLY. DECLARED AN EMERGENCY, LANDED WITHOUT INCIDENT. CLEANED AND RESECURED RT AND LT EMERGENCY PARKING BRAKE PRESSURE SWITCHES, OPS CHECK GOOD IAW MM 32-44-00. MESSAGE RETURNED ON TAXI OUT, RETURNED TO GATE. REMOVED AND REPLACED EMERGENCY PARKING BRAKE VALVE, OPS CHECK GOOD. TWO FLIGHTS LATER THE MESSAGE RETURNED ON TAXI. REMOVED AND REPLACED NR 2 PARKING BRAKE PRESSURE SWITCH IAW EMB 170 MM 33-44-09, OPS CHECK GOOD. TWO FLIGHTS AFTER THAT THE MESSAGE RETURNED AGAIN ON TAXI. AIRCRAFT WAS FERRIED TO IND. SECURED WIRES FROM PARK BRAKE MICROSWITCH TO TERMINAL BLOCK 2503 AND GROUND STUD 0408. OPS AND TAXI CHECK GOOD IAW EMB SWPM 20-64-00.