CORVALLIS — After grabbing the momentum and the lead, UCLA braced for an Oregon State challenge. Instead, the Beavers just gave up.

CORVALLIS — After grabbing the momentum and the lead, UCLA braced for an Oregon State challenge. Instead, the Beavers just gave up.

Ben Olson threw for 220 yards, Brandon Breazell had two touchdown receptions and the Bruins scored four fourth-quarter touchdowns to beat Oregon State 40-14 on Saturday night.

Oregon State returner Gerard Lawson fumbled three consecutive kickoff returns in the fourth quarter, losing two to set up Bruins touchdowns.

The Bruins (4-1, 3-0 Pac-10) got 80 yards rushing, 49 yards receiving and two TDs from Kahlil Bell. Olson, who was playing for the first time since suffering a concussion against Utah, was 14-for-25. UCLA has beaten the Beavers five straight times.

The Bruins finished with 353 total yards. They had just 110 at halftime.

"We just wanted it more," Olson said. "To come into this kind of environment on the road and come away with a victory is all that really matters."

Leading 14-12, the Beavers (2-3, 0-2) fell apart in the fourth quarter.

Last week, Oregon State led Arizona State 19-0 before allowing 33 straight points in a 44-32 defeat.

"We need to stop these games at halftime," Riley joked. "The last two weeks we'd have been happy."

Lawson was called for a personal foul for hitting Terrence Austin out of bounds on a punt return. Olson then found Breazell for a 69-yard score with 9:12 in the game to give the Bruins their first lead.

Then Lawson muffed a kickoff return. Then another. Then another.

The first one led to Bell's second touchdown. Breazell caught a 30-yard TD after the next fumble. The Beavers recovered the third but a punt was blocked. Chris Markey took a handoff in for a touchdown, and it was 40-14 Bruins about seven minutes after the Beavers had the lead.

Yvenson Bernard led Oregon State with 125 yards rushing. Sean Canfield was 22-of-35 for 146 yards and two interceptions for the Beavers. The sophomore quarterback has thrown 11 interceptions this year. The Beavers were missing star receiver-kick returner Sammie Stroughter, who suffered a bruised kidney against Arizona State.

Bell fumbled away the Bruins' first two possessions and UCLA's first five drives went nowhere. Oregon State scored on a 33-yard fumble return by Al Afalava and a 1-yard TD run by Bernard to lead 14-0. But Canfield killed two Oregon State drives with interceptions and the Beaver offense never really got on track again.

The Bruin offense, which had been held to 21 total yards in the first five possessions, woke up in the second quarter, with Olson and Bell putting together back-to-back scoring drives. Both ended in field goals from Kai Forbath of 37 and 28 yards to make it 14-6 at halftime.

"We got started when it really mattered and I am really proud of the way everybody came together," Olson said.

Reggie Carter forced Canfield to fumble at the Beavers 5, setting up Bell for a 1-yard TD dive. The two-point conversion failed.

Olson missed last week's win over Washington but returned this week after Patrick Cowan was lost to a knee injury.

Oregon State coach Mike Riley has never beaten UCLA. He is 0-9, including four losses when he was John Robinson's defensive coordinator at USC.