"Some of it was tyre pressures but I think, brake bias-wise I was in the wrong place so I was overheating the rears - it was a problem in Turn Six and Turn 11, " said the defending world champion.
The spring from Barrichello's car struck Massa's helmet just above his eye, and his feet are believed to have come to rest on both the throttle and brake, as his car ploughed head-on into a tyre wall at about 125mph.