Brooker started skiing at the age of four and competed in races in Ontario and Québec when he was 12 . In 1975 he won the Canadian junior downhill championship for the first time and moved up to the squad of the Canadian national ski team in 1977. After a serious knee injury, which forced him to take a break for more than a year in 1979, he won his first World Cup points in December 1981 in Val Gardena . Only three months later he was on the podium for the first time thanks to a second place on the downhill from Aspen .
In the 1982/83 season he celebrated his first two World Cup victories at the legendary Hahnenkamm Races in Kitzbühel and Aspen and ended the season in first place in the FIS downhill rankings. In the same year he was voted Skier of the Year in his home country . In the following years he established himself as a top downhill driver. In the course of his career he contested a total of 62 downhill runs in the World Cup, of which he finished 33 in the points. He took three wins, stood on the podium four more times and finished eight other races in the top ten.
In 1987 he suffered a serious fall on the Streif near Kitzbühel and suffered a serious injury to his already damaged knee, whereupon he ended his career. In the same year he received the Johnny F. Bassett Memorial Award for his sportsmanship .