"I'm very disappointed, but that's life."
Angus Young responded to A Current Affair in a statement, explaining that Rudd had changed from the bandmate they originally knew.
"Phil created his own situation. It's a hard thing to say about the guy. He's a great drummer, and he's done a lot of stuff for us. But he seems to have let himself go. He's not the Phil we've known from the past," Young said.
AC/DC in February announced it had replaced Rudd with former drummer Chris Slade for its Rock or Bust tour.
Rudd told the programme he was "pretty stressed out" after releasing his cheekily-titled solo album, Head Job, as it didn't sell well.
He is hoping to avoid jail time since changing his plea.
"I've seen the error of my ways and it's onward and upward from here."
Melbourne-born Rudd is due back in court on June 26 while AC/DC will kick off their Australia and New Zealand tour on November 4.
AAP