They seem to do it on the straights too.

I wonder if it is to confuse the guy behind about your next move?

 

The corners I can understand but as for the straights, I reckon N8ORTS suggestion is the most feasible so far, especially if they're using full on race pads although I can't imagine them cooling that quickly

Can the next person to do a 1st Lotus day ask Mr Walsh? He knows about these things

 

MarkB might know. He's done a bit of racing.

 

Maybe the videos are out of sync