The title rivals were behind the SC on lap 22 of chaotic race, and the cars were closely slaloming together with Hamilton in P1 ahead of Vettel.
The Brit suddenly braked into turn 16, causing Vettel to drive into the back of his car and damage the Ferrari front wing and Mercedes rear end.
A furious Vettel signaled angrily at Hamilton, then drove alongside the Brits and barged him to the side, wheel to wheel.
‘He brakes tested me,’ yelled an irate Vettel over the team radio. ‘What the f*** is going on?’
Hamilton was left surprised by the incident, saying on the team radio: ‘Vettel literally just turned into me and hit me.’
That strange incident resulted a 10-second stop-and-go penalty for Vettel in a chaotic race in Baku. Finally, the German managed to finish P4 ahead of Hamilton and extend his title lead to 14 points. Unlucky Hamilton came home in P5 due to a forced extra stop caused by a loose headrest.
“Nothing happened, did it?,” said Vettel to Sky Sports F1, when quizzed about the incident.
“He brake checked me as well, so what do you expect? I ‘m sure he didn’t do it on purpose but for sure it was not the right move. If I’m struggling, people at the back struggling even more, so I don’t think it was necessary.
“I got damage, he risked damage. He’s done something similar in China at the restart a couple of years ago so it’s not the way to do it, I think.
“After the incident, we were side by side, I raised my hand and showed him that I wasn’t happy with that.”
Vettel added to Channel 4: ” I have no doubt he brake-checked me. I didn’t run into the back of him on purpose. There is then a chain reaction.
“I think it was very clear. In the end we are racing with men. If one of us gets a penalty, we both do. We are both grown up men. We want to race wheel to wheel.
“The championship battle is still respectful I don’t have a problem with him, I think today’s action was wrong.
“Every week in the Premier League you have refs blowing the whistle, and some players agree, some disagree. It’s the same here.”