Shanghai: Red Bull were hit with a 5,000-euro ($6,500) fine after Mark Webber's right-rear wheel came off his car during the Chinese Grand Prix on Sunday in Shanghai, capping a terrible weekend for the Australian.
Webber's race ended on the 16th lap after his tyre came off, having been in the pits following a collision with Toro Rosso's Jean-Eric Vergne.
Red Bull were fined for releasing the car with the wheel not properly fitted, although race stewards acknowledged that the team were not aware of that when Webber was released from the pits and told him to stop once they knew.
Christian Horner, Red Bull team principal, said: "After changing the nose and all four tyres, Mark reported a problem with the right rear on the out lap, which had certainly left the pit lane fully torqued up.
"The right rear then came detached from the car and caused Mark to retire. Until we get the car back, it's not possible to yet conclude the exact cause."