Christian Lealiifano kicked an extra time penalty to earn the Brumbies a last gasp 23-20 victory over the Bulls in Canberra.
The result moves the Brumbies back to the top of the Super Rugby standings after the Chiefs had edged ahead earlier in the day.
The result is the Brumbies third consecutive victory over the Bulls.
The Brumbies were the better team in the first half and went out to a 14-3 lead by half time.
After the break however the Bulls outscored their hosts by 17 points to 9 through two tries and could have had a third if winger Lionel Mapoe had held on to the ball while crossing the tryline.
The Brumbies first half lead ensured that they never surrendered the lead to the Bulls although they drew level in the 78th minute with a try by JJ Engelbrecht and Morne Steyn's conversion.
After the Bulls had levelled the scores the match appeared to be destined to end in a 20-all draw but the Brumbies were awarded a penalty after the restart and Lealiifano stepped up to win it for the hosts.
The Brumbies scrum dominated the Bulls throughout the match, culminating in a yellow card to loosehead prop Morne Mellet in the 65th minute for repeated scrum infringements.
With the Bulls scrum one man down, the Brumbies pressed home their advantage, and nine minutes later Lealiifano kicked his fifth penalty goal of the night after another scrum infringement.
A 9-3 lead to the Brumbies late in the first half gave the home side the confidence to run the ball more, retaining possession for more than a dozen phases before fullback Robbie Coleman scrambled over the tryline after the halftime siren.
The Bulls declined a penalty shot directly after halftime, and after several phases winger Lionel Mapoe crashed over the line, only to lose the ball in a late tackle by Brumbies winger Henry Speight.
But winger Jurgen Visser scored in the 49th minute when he finished off a well-worked passage of play from the Bulls.
JJ Engelbrecht's try two minute's from time coupled with Morne Steyn's conversion levelled the scores at 20-20.
After the match Bulls captain Pierre Spies said he was proud of the way his undermanned team fought back in the second half after having loosehead prop Morne Mellett yellow carded for repeated scrum infringements in the 63rd minute.
"There's a lot of things we can take out of this tour, a lot of good experience gained, but we have to fight back when we get back home," Spies said.
The Brumbies faded in the second half after their trip back this week from their South African tour.
"It's not easy to win on the road, but the Bulls pushed it right down to the wire and I'm glad with the way our guys stuck to it," Brumbies skipper Ben Mowen said.
"We had one opportunity to train this week so trying to address attack issues when you've come off a hard loss is a challenge coming back from Africa.
"I'm really proud of the way the guys showed up this week. It wasn't an easy week to prepare, and to get a result like that is huge for us."
Final Score Brumbies 23 (14) Bulls 20 (3)
Tries - R Coleman
Pen - C. Lealiifano 6
Tries -J Visser, JJ Engelbrecht
Pen - M.Steyn 2
Con - M Steyn
Cards - M.Mellet (63rd min yellow)
Referee: Jonathon White
Assistant Ref 1:Angus Gardner
Assistant Ref 2:Rohan Hoffmann
TMO : Matt Goddard
1. Ben Alexander , 2. Stephen Moore , 3. Dan Palmer , 4. Scott Fardy , 5. Etienne Oosthuizen , 6. Peter Kimlin , 7. George Smith , 8. Ben Mowen (c) , 9. Nic White , 10. Matt Toomua , 11. Joe Tomane , 12. Christian Lealiifano , 13. Tevita Kuridrani , 14. Henry Speight , 15. Robbie Coleman
Replacements: 16. Siliva Siliva , 17. Scott Sio , 18. Fotu Auelua , 19. Colby Faingaa , 20. Ian Prior , 21. Andrew Smith , 22. Clyde Rathbone
Morné Mellet, Chiliboy Ralepelle, Werner Kruger, Paul Willemse, Juandre Kruger, Deon Stegmann, Dewald Potgieter, Pierre Spies Jano Vermaak, Morne Steyn, Jurgen Visser, Jan Serfontein, JJ Engelbrecht, Lionel Mapoe, Zane Kirchner.
Replacements : Willie Wepener, Frik Kirsten, Wilhelm Steenkamp, Arno Botha, Ruan Snyman, Louis Fouche, Francois Venter.