Fourth pole in a row for the title leader as Hamilton cites ' glazed brake disc ' after errors ; merc dominate in rain .
Vettel recovers from Friday woe to third ; Bianchi in Q2 as Hulkenberg exits in q1
Fourth pole in a row for the title leader as Hamilton cites ' glazed brake disc ' after errors ; merc dominate in rain but Vettel recovers from Friday woe to third ; Bianchi in Q2 as Hulkenberg exits in q1