Vestar Capital Partners, the US-based private equity firm, has backed the €230m ($230m) buy-out of Sab Wabco, which produces brake systems for trains, marking Vestar's second deal in Europe this summer.

Robert Rosner, president of Vestar in Europe, said the firm has known Cardo, Sab Wabco's parent company, since 1990, when Cardo had invested alongside the private equity firm in the US.