Romain Grosjean and Esteban Gutierrez were left to lament a 'difficult day' for Haas as both drivers encountered troubles at the Chinese Grand Prix.
Grosjean was only 16th fastest in the second practice session while team-mate Gutierrez amassed just six laps across the three hours of running.
A gearbox sensor problem halted Gutierrez in the morning session before his rear brakes caught fire in the afternoon, ending his day prematurely.
"It was not an ideal day for the team. Esteban had a lot of problems. We had to try the new front wing, but the track is very difficult to understand.
"We’ve not managed to get everything working properly. The car is very difficult to drive. It’s not so easy.
"Tonight’s going to be a long night for the guys trying to analyse what we could do better for tomorrow. Right now, we’re not at all where we think we could be.
"We need to understand that and work with that. Today it hurt us that we’re a new team and we don’t have data from previous years. We’ve tried a few different things, but nothing seems to be the fix right now."
Gutierrez is hopeful that Haas will be able to address its problems prior to Saturday's third session.
"It was a very difficult day." he said. "It’s going to be very important to analyse all the data this evening in order to sort out the issues and prepare for tomorrow and the rest of the weekend.
"The team has been working hard and I’m positive that we’ll rectify the situation."