 Nyora kupfuurira kweiyi ndima - Kubudirira kwebhizimisi naFord kwakanga kusiri pasina budiriro. Brock akahwina mujaho wake wekutanga weATCC kubva muna 1986 paakamhanyira kukunda mumutambo wekupedzisira weATCC 1989 kuOran Park kunotora 3rd mumakwikwi kumashure kweShell Sierra yaDick Johnson naJohn Bowe. Brock akaenderera mberi kuti atore nzvimbo yake yekupedzisira yeBathurst pa1989 Tooheys 1000, asi kukundikana kwehubhu yekumashure kwakakonzera kuti mota yeNo. 05 ibve pamudyandigere pa lap 81 apo Sierra yechipiri yechikwata 105 inotyairwa naBrad Jones naPaul Radisich vakapedza vari 9th nzvimbo. Pakupera kwegore, Brock naRadisich vakatyaira Sierra kukunda muNissan-Mobil 500 Series muNew Zealand. Brock akatorawo nzvimbo yepamusoro yeGroup A inotsigira mijaho pa1989 Australian Grand PrixmuAdelaide, kunyange zvazvo akakwanisa kupedza wechipiri uye wechishanu mumakwikwi maviri mushure mekutenderera kwakakonzerwa nematai ake eBridgestone asina kubata mamiriro anopisa panguva yemakwikwi eSvondo, kana mamiriro akanyorova kwazvo neSvondo. 