Sergio Perez has stepped up his attack on F1 tyre supplier Pirelli, after his "explosion" in Korea a few days ago.
Pirelli had played down the Mexican's failure, saying it was simply caused by Perez badly locking the brakes on his McLaren.
"That something happens after a brake lockup is absolutely unacceptable," Perez is quoted by Germany's Auto Motor und Sport.
He said he doubts Pirelli's official explanation.
"I've never heard of a brake (lockup) automatically leading to an explosion of tyres," said Perez.
"For me it was not normal: it's unacceptable that the tyre explodes."
Perez's attack follows those of Fernando Alonso and Mark Webber, towards...
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