Brussels is 4 hours ahead of Brasília
Best overlap: 8:00 AM to 2:00 PM in Brasília is 12:00 PM to 6:00 PM in Brussels.
Your shared working hours run 8:00 AM to 2:00 PM in Brasília (12:00 PM to 6:00 PM in Brussels). Brussels is 4 hours ahead of Brasília, and with 6 hours of overlap you can even run back-to-back calls without stepping outside business hours. Just remember Brussels changes its clocks for daylight saving and Brasília doesn't, so confirm the overlap whenever the seasons turn.