Kamui Kobayashi says he had a "pretty scary moment" as a brake failure cause him to retire from the Spanish Grand Prix.

Two-thirds in to the race, Kobayashi ran very wide at Turn 1 having failed to slow the car down properly, and just managed to avoid the tyre barrier in order to return to the pits. Caterham investigated the incident but found that a brake failure was to blame and Kobayashi said he was relieved to avoid a big accident.

"My start was pretty good and I was up to 18th by the end of lap one having passed [Max] Chilton, but I couldn't keep [Pastor] Maldonado or [Jean-Eric] Vergne behind me and lost places to them by lap five so just focused on my own race," Kobayashi said. "The car felt OK but I still had the same traction issues as we'd had all weekend so it was still a bit of a handful, but the deg levels on the first set of medium tyres that we'd started with were good so we could run a very long first stint, finally boxing on lap 23 for another set of mediums.

"The car felt better on the second set of tyres and I was able to make up some time to [Jules] Bianchi ahead, but then on lap 44 I had a pretty scary moment going into turn one when the left front brake failed and I was just able to keep the car out of the wall. That was the end of my race and the end of a difficult weekend."

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While Caterham has struggled all weekend, Kobayashi said he was pleased to see the response from the team to the lack of pace.

"We clearly don't have the performance we're targeting, but changes have been made to help us sort this out and the whole team is working harder than ever to make progress, and we have two days of testing here to help us learn more about the new parts we brought to Spain, so we'll aim to fight back in Monaco."