Daniel Ricciardo has confirmed that suspension failure ended his run of 15 races in the points at the Brazilian Grand Prix.
Ricciardo spent much of the first half of the race in the lower reaches of the top 10 before going wide at the Senna S with what the Australian thought was a brake problem.
He returned to the pits where Red Bull diagnosed a suspension problem and retired his RB10.
"From yesterday afternoon, [my] weekend went downhill, I have to be honest I felt a little bit of wobbles when I was braking, it was behaving a little bit weird, I thought it could be tyres, so you don’t take too much notice but when I braked into Turn 1 it went right," he said.
"I went in the pits, team told me it was a suspension failure."
Despite his retirement, Ricciardo is assured of third place in the championship.
Team-mate Sebastian Vettel recovered from an error on the first lap to finish fifth.
"[I had a] good launch, nowhere to go, turn 4 maybe I don’t have the best memories from two years ago," he said.
"[I] left too much space, lost the car and two positions as I couldn’t go on the power, so lost some momentum, had to fight hard to get the positions back throughout the race.
"Beginning of the race we were hoping for more against the McLarens but we weren’t as competitive today, hoped maybe for one more position but fifth is good enough."