for the following season, he remained in the same series, joining penistone racing, partnering julian bailey in their reynard sf84. brabham regularly outpaced his team-mate, and despite team orders not to outperform his team-mate, he still was not disgraced taking sixth overall in the final championship positions. during 1984, he tried his hand at other categories, including racing sport cars in the thundersports series, taking his maiden victory at snetterton, sharing a tiga-ford ts84 with tim lee-davey. with no top single-seater drives available for him in 1985, brabham had a slight reprieve through the thundersports series, where he raced for the techspeed racing team in a shrike-ford p15 alongside divina galica, recording five second places.