 Complete the following phrase:  Despite his success with Cooper, Brabham was sure he could do better. He considered buying Cooper in partnership with Roy Salvadori and then in late 1959 he asked his friend Ron Tauranac to come to the UK and work with him, producing upgrade kits for Sunbeam Rapier and Triumph Herald road cars at his car dealership, Jack Brabham Motors, but with the long-term aim of designing racing cars. Brabham continued to drive for Cooper, but on the long flight back from the 1960 season-opening Argentine Grand Prix, he had a heart-to-heart with John Cooper. Johns father Charlie and the designer Owen Maddock had been reluctant to update their car, but although a Cooper had won in Argentina, other cars had been faster before they broke down. Brabham helped design the more advanced Cooper T53, including advice from Tauranac. Brabham spun the new car out of the next championship race, the Monaco Grand Prix, but then embarked on a series of five straight victories. He won from the front at the Dutch, French, and 