Beiqi Foton Motor, one of China\'s largest commercial vehicle manufacturers, will recall 357 Auman model tractors due to a defective component in the exhaust braking system, the country\'s consumer watchdog said Friday. The tractors to be recalled were manufactured between Oct. 20, 2009 and July 30, 2010, the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) said in a statement on its website. Due to a design error, the clamp that connects the butterfly valve in the exhaust braking system may loosen and cause air leakage, which will affect braking and pose safety risks in extreme circumstances, the statement said. The Beijing-based company will install new clamps and valves for free. The recall will start Jan. 5, 2013, according to the statement.