UPDATE 1-Uber investor sues to force former CEO Kalanick off board

(Adds details from lawsuit)

Aug 10 (Reuters) - Venture capital firm Benchmark Capital is suing former Uber Chief Executive Officer Travis Kalanick to force him to leave the board of the ride services company and rescind his ability to fill three board seats, according to a copy of the lawsuit obtained by news website Axios.

Kalanick, who was forced out as chief executive following a series of embarrassments for the company, had tried to "pack Uber's board with loyal allies in an effort to insulate his prior conduct from scrutiny and clear the path for his eventual return as CEO," Benchmark said in the lawsuit filed in Delaware court on Thursday.

Uber's board in 2016 agreed to expand the number of voting directors from eight to 11, with Kalanick having the sole right to designate those seats, according to Benchmark. (http://bit.ly/2vrf8M0)

After he left as CEO, Kalanick appointed himself to one of those seats, Benchmark said. Benchmark asked the court to force him to step down and stop him from appointing other directors.

Benchmark, an early investor in Uber, said that it never would have given Kalanick the three extra seats if it had known about his "gross mismanagement and other misconduct at Uber," the report said.

Uber declined to comment. Benchmark Capital and a spokesman for Kalanick did not immediately respond to requests for comment.

(Reporting by Anya George Tharakan in Bengaluru; Additional reporting by Peter Henderson in San Francisco; Editing by Shounak Dasgupta and Lisa Shumaker)