Brabham retired to Australia after the 1970 Formula One season, where he bought a farm and maintained business interests, which included the Engine Developments racing engine manufacturer and several garages.
Brabham retirouse a Australia logo da tempada 1970 de Fórmula Un, onde comprou unha granxa e mantivo intereses comerciais, que incluían o fabricante de motores de competición Judd e varios garaxes.