Hydraulic leak sidelines Button and McLaren once again in Barcelona

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Jenson Button has been sidelined once again on the first day of the final pre-season F1 test in Barcelona, after a hydraulic leak forced McLaren to change the engine on his car.

Following a change to Honda power units for the 2015 Formula 1 season, McLaren has endured a difficult winter as problem after problem rears its head on the new MP4-30.

In Barcelona last week, Button could complete just 45 laps in total due to a recurring issue with the seal of the MGU-K component on the Honda power unit.

Although teammate Fernando Alonso did manage to complete 59 laps on Friday, the Spaniard’s Sunday running was curtailed after just 20 laps following an accident that meant he had to be airlifted to hospital.

With just four days of testing left in Barcelona this week, Button had been hoping to drive the car in anger – something he confirmed last week he is yet to do – and find his feet with the MP4-30 before the first race of the year in Australia.

However, with just seven laps on the board on Thursday, McLaren confirmed that it had to park up and change the engine on the car following a hydraulic leak.

The team is yet to confirm who will be driving the car on Friday in Barcelona, but reserve driver Kevin Magnussen is set to complete some running over the next three days while Alonso recovers from his accident.