The former Melbourne Storm loose forward scored a try and showed a high workrate as the Warriors gained their first win of the year.
Coach Matthew Elliott had plenty of praise for Lowrie's display in front of 15,500 fans at Forsyth Barr Stadium.
"I believe he was our best player by a fair bit," he said.
"He was outstanding."
However, the match finished with an injury concern for the Warriors after star halfback Shaun Johnson left the field in the second half with an elbow problem.
Elliott said the extent of the injury would not be known until Sunday.
The Warriors dodged several bullets - the Broncos were denied no fewer than five potential tries by the television match official.
The contest was effectively decided in 13 second-half minutes when the Warriors scored their three tries, the first two via outside backs Manu Vatuvei and Glen Fisiiahi.
The Warriors led 2-0 at halftime and the match's first try didn't come until Brisbane winger Lachlan Maranta dotted down nine minutes into the second half.
Centre Justin Hodges was always dangerous for the visitors and there was some justice that he should get Brisbane's second try with the last act of the game, with the Broncos declining to attempt the conversion.
Elliott was delighted with his players' defensive effort.
"I thought they were outstanding defensively, which was very pleasing," he said.
"We've still got some work to do with the ball though, but it was nice for the boys to get some reward for the hard work they put in."
The Broncos created plenty of chances but paid for their inability to finish more of them.
"It was a valuable work-out," coach Anthony Griffin said.
"But we missed too many opportunities to be satisfied with our performance."