Haas has changed its driver line-up for the final day of Formula 1 pre-season testing, following the mechanical dramas that have limited its running this week.
The American outfit has had a difficult time in the final test, having been hindered by a fuel system issue on Tuesday, turbo problems on Wednesday and brake-by-wire difficulties on Thursday.
The troubles mean the outfit has completed just 102 laps this week – less than a quarter of that achieved by the Mercedes team.
Team principal Gunther Steiner admitted that the events had been a blow to his outfit, which had enjoyed some solid running in the first week.
“This week was not as expected because we didn't run for two days,” he said on Thursday. “That is our biggest setback.
“This could have happened on Monday and we would have understood the car better. Today was one of the learning days, and as long as you have the chance to learn that is positive.
“It is tough but positive: you hurt yourself but you learn.”
Because of the extremely limited running that Esteban Gutierrez had on the first two days, Haas has elected to bring the Mexican back into action on the final day of the test.
Now, Romain Grosjean will run this morning while Gutierrez will replace him in the afternoon.