The BT48 made its debut at the 1979 Argentine Grand Prix with Niki Lauda driving. Teammate Nelson Piquet qualified the older Brabham BT46 in 20th place. Lauda qualified the BT46 in 23rd place but drove the BT48 in the race when he retired with fuel system failure. Piquet was involved in a huge first lap pile-up and was injured; he did not take the restart.