F1: Red Bull unable to identify cause of Vettel's second heart-brokening race

As darkness fell at Albert Park on Sunday night, Christian Horner would not confirm that brake failure pitched pole sitter and race leader Sebastian Vettel out of the Australian grand prix. After the spark plug problem in Bahrain, German Vettel, 22, initially told his team over the radio - and then reporters in the paddock - that he thought his left-front brake disc had failed.

















