The loss spoiled redshirt freshman Sean Mannion's debut as starter for the Beavers, who fall to 0-3 for the first time since 1996.
Mannion completed 24 of 40 passes for 287 yards and a touchdown, but he was also intercepted and had a costly fumble for a UCLA score.
After the Bruins scored to make it 27-19 with 6:15 to go, the Beavers were stopped at the UCLA 22-yard line when they tried to go for it on fourth-and-eight.
Brehaut, who was named starter after Kevin Prince struggled in last week's loss to Texas at the Rose Bowl, completed seven of 11 passes for 146 yards for the Bruins (2-2, 1-0 Pac-12).
We'll have more coverage on BF.C a little later this evening..
Beavs can't hold serve at home, drop to 0-3
BeaverBlitz Top Stories
Visit Report: Morris talks position moveOne of the cornerstones of the 2017 class, David Morris catches Blitz members up on his Oregon State official visit, a position change and what stood out this weekend.
BeaverBlitzYesterday at 9:29 PM
Visit Report: Bowcut solid in decisionThe first visit report of the weekend is in and Sherwood's Josh Bowcut talks about his experience on his visit to Oregon State this weekend.
BeaverBlitzYesterday at 2:38 PM
Pre-visit: Pututau talks OSU visitOregon State will be hosting Utah athlete Taniela Pututau this weekend on an official visit. We caught up with him to get his thoughts on the Beavers.
BeaverBlitzThursday at 8:44 AM
Pre-visit: Wellsfry Ready For OfficialCoaches are gearing up for another week of official visitors to the Oregon State campus, including offensive line commit Brock Wellsfry. BeaverBlitz checks in to see what he's…
BeaverBlitzWednesday at 3:26 PM