Scooter Braun is sick of the rapper bringing Bieber down, so has urged him to cut ties with Twist entirely once and for all.

Twist was been accused of battering a girl at Bieber’s Calabasas mansion Thursday morning. He’s also known for smoking pot, driving like a lunatic, and getting a DUI.

Bieber has refused to turn his back on Twist once already — but Scooter has had enough, telling Bieber the battery allegations are the last straw, TMZ reports.

“Scooter thinks Lil Twist is nothing but a parasite sucking Justin dry. He wants Justin to ditch him before he does any more damage.

“But Justin is still sticking by his buddy. He and Scooter had a blowout fight on Thursday when Scooter said Twist had to go.”

Meanwhile, Bieber is laying down the law with his other friends.

The singer has read the riot act to the pals who use Calabasas mansion, and race up and down streets in his sports cars.

Bieber has apparently told his hangers-on that their late-night party noise must cease immediately!

“Justin told them that all the bad publicity and police activity is ruining him – and while he’s willing to take responsibility for his own actions, he refuses to take heat for theirs!” a source said.

“He feels like he’s being buried by an avalanche of negativity after getting buckets of hate mail from irate neighbors accusing him of endangering their kids.

“Justin’s reps finally told him enough is enough – stop terrorizing the neighbors before a tragedy occurs and your career is ruined!”

Tags: justin timberlake, lil twist, scooter braun