Williams says it will investigate the problem that saw Pastor Maldonado lose a wheel nut during the second Friday practice session for the Indian Grand Prix.

The Venezuelan had just completed a pit stop when the nut on his left front wheel became detached and rolled away across the circuit, leaving Maldonado to try and return slowly to the pits.

Having got as far as the pit entry, Maldonado was forced to then park his car on the side of the circuit, with Williams set to look into the cause of the failure.

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It left Maldonado down in 16th place on the timesheets, three places behind team-mate Valtteri Bottas.

"We completed some aerodynamic tests on both cars during FP1 and overall the drivers happy were happy with the car," chief race engineer Xevi Pujolar said. "As always we see understeer at this circuit so we continued to make changes to the set-up as the track conditions improved throughout the day. We made some changes to the rear wing level in FP2 to improve our top speed and were planning long runs with both drivers to evaluate the tyres.

"Unfortunately we had to cut Pastor's run short as we had a problem with the front-right wheel nut following a pitstop. We are still investigating what happened.

"Valtteri continued with some mechanical tests followed by a longer run on the soft option tyre, so we have some good data for this compound. We need to continue tomorrow to gather more information on the medium tyre to make sure we have enough information to prepare for the race on Sunday. Overall the car balance looks better at this circuit, but we need to try to extract a bit more performance ahead of qualifying."