SAN FRANCISCO (Reuters) - A U.S. judge on Thursday said ride service Uber [UBER.UL] and its drivers have failed to provide enough information for him to rule on a proposed settlement in a lawsuit over driver benefits.

U.S. District Judge Edward Chen in San Francisco ordered both sides to submit additional briefs, saying the settlement worth up to $100 million could still be clarified to win his preliminary approval.

(Reporting by Dan Levine; Editing by Chris Reese)