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Livewire striker Dylan Wenzel-Halls bagged his seventh goal of the season early in the match and midfielder Riku Danzaki extended the winning margin just before the hour mark.
It was a costly loss for Macarthur who could have moved just one point shy of top spot with victory.
The fledgling A-League side went into the contest seeking a club-high fourth successive win.
Brisbane, conversely, have been a side bereft of confidence and woefully out of form on an eight-game winless run dating back two months.
The Roar had produced just three goals in their last four matches, yet the evidence of the first half ran contrary to expectations.