For example, if I travel to Thailand and buy there. When I come back I bring the bike with me and if they see the bike is used, I can say that I already bring it from Brazil with me. The bike is my property, transportation. They don't apply taxes, then.
If I would import from Brazil when the bike arrive here they will charge 60% of total and a lot of other taxes, but nevertheless is worth it than purchasing here in Brazil.
I hope it's not confuse. lol