Second. It isn't that vehicles cost a lot more in Brazil than AUS, it is the exchange rate that plays a major role. Exchanging your dollars for Reals requires that there is a strong market of Brazilians wanting to exchange their Reals for your dollars. A more favorable exchange occurs when a greater demand for dollars exists.
The dollar is really weak right now (1.78 USD to 1 Real). Two/three years ago you could find it at upper 3 to 4 to one real.