Fernando Alonso's second practice in Brazil ended prematurely after an ERS problem.
The Spaniard slowed with just over half an hour of the session, being asked to "jump" clear of the car.
It was later revealed that a loss of water pressure in the system that cools the ERS was the problem with Alonso's car but they hope their quick thinking in getting Alonso to shut down the car quickly will allow them to carry on this weekend with minimal disruption.
Meanwhile a gearbox sensor problem for Jenson Button has delayed the Brit.
Bahrain International Circuit - Winter testing