After trailing 21-14 at the break, the defending champions piled on six unanswered second-half tries on Friday night to shoot to the top of the table in devastating fashion.
Centre Vince Aso bagged a hat-trick, including two in six minutes early in the second half to blow the game open, while Callum Gibbins collected a double at McLean Park.
Boasting the best defence in the competition heading in to the match, the Brumbies simply had no answer after the break as Beauden Barrett delivered an attacking mastersclass.
