RAC head of brand Gary Elliott, to whom Brill reported, is to retain direct control of PR and the eight-strong team until a replacement is found.
'We are looking to reappoint, but Peter's departure comes as an unplanned opportunity to look at the PR structure and see how much further we can go in developing and operating an agency type service for each of the RAC's businesses,' he said.
During his tenure, Brill oversaw the RAC's major re-branding campaigns and the move to plc status. He first joined as head of breakdown PR, and headed three other departments before being made overall PR head two years ago.
He will continue to offer a media relations service and is branching out into media training with Bristol-based Mentor Communications. He is also planning a return to his broadcast journalism roots.
'I intend on keeping my fingers in several PR pies,' said Brill, who left last week.