It seems, that Brazil needed some time to overcome the shock of the historical loss against Germany before (Germany never ever won a single match against Brazil before at WC or Olympic Games you should know).
Not true. I remember that Andrzej Niemczyk, ex Polish NT coach, was coach of German NT as well. He was telling many times that he lost 5 friendly matches against Brazil and won that one the most important at the Olympics. I guess he was coach at 1988 OG when East Germany beat Brazil 3:1.