During the mid-1980s, Brayton helped introduce the Buick stock-block V-6 engine to Indianapolis. His father's firm, Brayton Engineering, was a major developer of the race engine. In 1985, he qualified 2nd and set the one-lap Indianapolis Motor Speedway track record in the process. He dropped out early and finished 30th when the engine expired. He would not finish the race again until 1989, when he scored his best finish at the Speedway, 6th place but seven laps down. He would equal this finishing position in 1993, driving a Lola-Cosworth for Dick Simon Racing.