The car was driven by reigning world champion Piquet who was joined at Brabham by the Fabi brothers Teo and Corrado in a shared drive allowing older brother Teo to honor commitments in the North American–based Champ Car World Series for Forsythe Racing (Teo Fabi had started racing Champ Car for Forsythe in 1983 and sat on the pole for the 1983 Indianapolis 500, being only the second rookie in 500 history to do so). Corrado replaced Teo three times in 1984, the first being Monaco when Teo was racing in Milwaukee. The other two were in North America as Teo missed both the Canadian and Dallas Grands Prix while racing at Portland and Cleveland respectively. Teo Fabi also missed the season ending Portuguese Grand Prix when he was racing the Champ Car race at Laguna Seca. Fabi was replaced in Portugal by Manfred Winkelhock who had raced the first 13 races of the season for the ATS team.