The victim, Samantha Geimer, said previously that she had forgiven Polanski, but this will be the first time she appears in court on his behalf.
The Los Angeles judge commended Geimer for speaking out, telling her: "Your words mean a lot to this court".
He pleaded guilty to having sex with her but fled the USA after spending 42 days in jail in 1978 fearing that a plea deal would be overruled and that he would receive a long sentence.
Braun has said he believes a transcript of closed-door testimony from former Deputy District Attorney Roger Gunson will confirm a plea deal negotiated in 1978 calling for Polanski to be sentenced to time already served behind bars.
Polanski is trying to have his outstanding global arrest warrant lifted.
She echoed that sentiment Friday morning, in a hearing before judge Gordon who is handling the current iteration of Polanski's case.
Roman Polanski's sexual assault victim has asked a judge to end the 40-year-old case against the fugitive director.
"I was a young and sexually active teenager", she said. Braun also argues that Polanski served an additional 10 months under house arrest during a failed extradition effort from Switzerland in 2010.
Polanski, whose films include "Rosemary's Baby" and "The Pianist", was arrested on US warrants in both Poland and Switzerland during the past decade, but both countries ultimately declined to extradite him.
Polanski is a citizen of Poland and of France.
In April, Geimer tried to get the DA prosecuting the rape case against Polanski to drop it from continuing to go forward by sending him "a harsh letter".
Gordon said at the end of Friday's hearing that he would take the request under consideration, but did not indicate when he would issue a ruling.
Samantha Geimer was just 13 when she was raped by Polanski at a Hollywood party, and he subsequently pleaded guilty to having unlawful sex with a minor, but left America and fled to his home in France on the eve of sentencing in 1978. At one point, Braun said he had "done everything I can to resolve this case".
A lawyer for Polanski says Geimer, a sex crime victim, will appeal to a judge to end the case against him. Now, Roman's own victim is begging the courts to drop the case and let Polanski return without fear of prosecution.
Polański fled the United States in February 1978, shortly before being sentenced for unlawful sex with a 13-year-old girl.
It was not clear whether Geimer or Tate would be permitted to address Friday's court hearing.
Geimer, who now lives in Hawaii and was accompanied to Friday's hearing by her husband of almost 30 years, told the judge he could explore various avenues to settle the matter, including dismissing it, sentencing Polanski to time served or recalling an global arrest warrant against the director.