Robin Frijns was the man behind the wheel as Caterham conducted a Pirelli tyre test in Bahrain on Tuesday.
While the rest of their rivals lapped the track developing their own cars, part of Caterham's duties on Day One at the Sakhir circuit was to develop the Pirelli tyres.
Following on from last year's complaints, this season every team will devote one day of in-season testing to Pirelli's tyres.
However, test driver Frijns managed just 63 laps on the day as a hydraulic issue curtailed his running.
The Dutchman's best time was a 1.40.027, which was over two seconds quicker than what he clocked in Friday's first practice at last weekend's Bahrain GP.
"I'm glad we managed to complete 63 laps this morning but it's obviously a shame we couldn't add to that in the afternoon, especially as I felt good in the car an was enjoying myself," he said.
"When we finished the last run before lunch we found a hydraulic system leak that meant the guys had to take the floor and gearbox off and with the time it would have taken to rebuild the car we made the call to end the session early so we could prepare for Day Two."
As for the Pirelli tyre test, Frijns revealed that neither himself nor the team were aware of what compounds they were running for the tyre manufacturer.
"There's not much I can say about the tyres we were running today as they're obviously development sets and because it was a Pirelli test today we weren't aware of what compounds we were running.
"Now Marcus takes over for tomorrow, our last day on track in Bahrain this year, and we'll aim to have a clear day of our own test so we can leave Bahrain with as much information as possible from our last day here."
Gallery: Sensor Centre In Sakhir