Bahrain pole sitter Jarno Trulli admitted after qualifying that he is concerned about an issue aboard his Toyota.

Bahrain pole sitter Jarno Trulli admitted after qualifying that he is concerned about an issue aboard his Toyota.

The Italian headed the Japanese team's first ever front-row lockout in the Sakhir desert, but revealed afterwards that his brakes were not working properly.

"I was struggling with the brakes, the pedal was getting long and I was not able to brake the way I wanted," said Trulli, who also put his Toyota on pole with very light fuel at Indianapolis in 2005.

The problem did not stop the 34-year-old from emerging quickest from Q3, but admitted he is concerned ahead of Sunday's 57-lap race.

"We need to analyse the data to see if we have a problem with the brakes, it is a bit of a worry," Trulli said on Saturday.

Another worry might be strategy, which will become clearer when the FIA publishes the car weights later this afternoon.

Red Bull's Christian Horner said after qualifying: "I think they (the Toyotas) might be three-stopping. We'll find out later I suppose."