It was a game in which the Tangerines dominated throughout, yet, as has happened throughout the season, lack of concentration proved costly and despite the various permutations used during the campaign, it is clear to Brewster that he needs to rebuild his backline.
After Saturday's debacle against Falkirk, it was not surprising that Brewster made four changes to his line-up, restoring the departing David Fernandez and Jim McIntyre to the team.
It was the departing McIntyre, captain for the night, who almost opened the scoring with an excellent effort that was blocked in the sixth minute. Then two minutes later he put in a tantalising cross for Collin Samuel to powerfully head towards goal, only for Allan McGregor to produce a wonderful one-handed stop.
As United continued to dominate they almost lost a goal through careless defending. A reckless backpass from Garry Kenneth in the 22nd minute gave Mark Burchill a chance to run in on goal, however an excellent stop from Craig Samson prevented an opener.
Again, five minutes later, United presented the Pars with a gift following indecision from the erratic Samson. With no danger, he dived for a low cross, electing to push the ball rather than hold on, only to put his defence under tremendous pressure.
The second period continued as the first with the Terrors in the ascendancy throughout. First, Samuel failed to hit the target with an opportunity in the 47th minute, then shots from Ross Gardiner, then Charlie Mulgrew, both looked as if they would burst the net, but both whisked past the post with McGregor beaten.
As the hosts continued to run the show, referee, Craig Thompson, who had been poor throughout waved away in the 70th minute what appeared to be a clear penalty claim for the Tangerines, when Scott Wilson clearly tugged Fernandez.
Pressure intensified with McGregor constantly in the thick of the action, but totally against the run of play, the Pars took the lead.
"Yet again, the curse of United's defence struck. With no apparent pressure, Kenneth failed to clear, giving Frederic Daquin the chance to curl a superb 16-yard shot into the top corner.
The Tangerines responded with pressure and possession, but they could not create that all-important opening and the Pars held on for an unlikely victory.