Mitchell Johnson has continued his solid form with the ball, taking a total of 28 wickets in this Ashes series.
Chris Rogers recovered from a nasty blow to the head to score a dogged half century as Australia reached 96-3 at tea on the second day of the fourth test against England.
Jimmy Anderson (2-32 ) dismissed Michael Clarke in the only wicket of the middle session after Australia lost opener David Warner and Shane Watson before lunch in pursuit of England's first-innings 255.
Stuart Broad smacked a short ball into the visor of Rogers' helmet shortly after lunch, drawing blood near his temple. But after receiving attention on the pitch, the left-hander continued his innings untroubled and was unbeaten on 50 at the break with Steve Smith on 14.
Earlier, Mitchell Johnson (5-63) claimed England wickets to bring up another five-wicket haul.
He took 3-4 from four overs on to finish with 5-63 in England's first innings of 255.
The left-arm quick lifted his tally for the series to 28 victims at 14.96.
Johnson struck twice in the second over of the day, removing Tim Bresnan caught at short leg and Pietersen bowled.
It was an awful shot from Pietersen, who had stood firm so brilliantly in the face of his critics on Thursday in four hours of determined batting against tight bowling.
While Pietersen deserves praise for becoming England's fourth-leading runscorer, moving nine runs past Geoff Boycott's 8114, his shot selection has once again become a hot topic.
Stuart Broad was lbw to Johnson and Nathan Lyon bowled rival spinner Monty Panesar.
"It's going all right. I am enjoying it," Johnson told the Nine Network.
Johnson said the Aussies had bowled well as a group. Pace partner Ryan Harris took 2-47 off 24 overs in a tremendous performance that featured four missed catches