 Complete the following phrase:  Brabhams professional racing career began in Australia in 1983, racing karts for two years, after which he moved into the Ford Laser one make series for 1985. In 1986 he switched to Formula Ford 1600 and subsequently to Australian Formula 2, winning the 1987 Australian Drivers Championship in that category. The 1987 ADC was, unlike previous years, only held as a single race rather than a series of rounds and was run as a support category to the 