Two goals from Filip Hallander and three points apiece for Jonathan Dahlen and Oliver Kapanen did the damage at SCA Arena, in what was a dominant performance in attack.
That win is Timra's third in a row against Brynas, who have now lost back-to-back matches following a 4-2 loss to Linkoping last time out, which ended a run of six consecutive victories.
Brynas' lead at the top is still a healthy one, though it has been cut to 10 points following Frolunda's narrow 2-1 win over HV71.
Oscar Fisker Molgaard put HV71 in front in the second period, but a Filip Cederqvist equaliser ensured the home side's lead lasted less than three minutes.
Midway through the third, the Gothenburg side took advantage of a powerplay and scored the winner through Arttu Ruotsalainen - his eighth goal of the season.
That marked a fifth win in succession for the reigning champions, since defeat to Brynas at the end of January.
Frolunda have also opened up a one-point gap between them and third-placed Lulea, who needed a shoot-out to beat Rogle at home.
The visitors found themselves 3-0 down in the first period, only for debutant Lubos Horky to get them back into the game with two goals, endearing him to his new fans.
Josh Dickinson levelled the match in the final minute of the third, only for Anton Levtchi to score the decisive goal in the shoot-out and deny Rogle a remarkable win.
Skelleftea profit from Farjestad hangover
Still reeling from the disappointment of losing the Champions Hockey League final earlier this week, Farjestad BK were defeated again on Thursday night, this time 5-2 at home to Skelleftea AIK.
Despite battling from two goals down to level the scores, Farjestad had no answer after the midpoint of the match, especially to Rickard Hugg, who scored twice and grabbed an assist.
It's now five SHL defeats in succession for the team from Karlstad, adding to their European disappointment.
Elsewhere, Vaxjo Lakers and Leksands IF kept pace with the top six - the Lakers doing so in fine style with a 6-2 win over Malmo Redhawks, while Leksands won 3-2 at home to Modo Hockey.
In the match between 11th-placed Orebro HK and 12th-placed Linkoping HK, the former improved their postseason ambitions with a 2-1 victory on home ice.