Lewis Hamilton completed a practice double for the Hungarian Grand Prix to lay down the title gauntlet to Nico Rosberg.
Hamilton’s quickest lap of one minute 23.949 seconds was more than half-a-second clear of Rosberg who finished the session only fourth fastest.
On an encouraging day for the Red Bull team, who are in the midst of a lacklustre campaign, Daniil Kvyat was second fastest, 0.351secs slower than Hamilton with Daniel Ricciardo a further tenth back.
Their strong display was dampened however when Ricciardo suffered a Renault engine failure.
With plumes of smoke billowing from the back of his Red Bull, the Australian was forced to pull off the track at turn 11 which saw the third red flag of an incident-packed day.
It began with an enormous shunt for Sergio Perez which saw Force India withdraw both of their cars for the second session amid safety concerns.
The Mexican driver lost control of his Force India on the exit of turn 11 after he suffered a rear suspension failure.