After Broad removed Warner and Marnus Labuschagne in consecutive balls within the first hour, Steve Smith was lbw to Ben Stokes just before lunch to leave Australia 3-78 in reply to England’s 8(dec)-393.
After earning a reputation as Broad’s bunny in the last Ashes series in England, Warner fell for nine on Saturday morning when he played on to the Englishman.
It came as part of a double-blow, with Broad taking Labuschagne’s wicket first ball to put the hosts on top of the first Test.
Smith and Usman Khawaja (40no) steadied the ship for the next hour, before the vice-captain was trapped on the pad going back and across to Stokes on 16.
The Australian vice-captain immediately reviewed, and while the ball struck him on the pad flap, ball-tracking showed it was going on to hit the stumps.
After the start of play was delayed by five minutes by light rain and heavy cloud lingered overhead, this was a day made for Broad and swinging conditions.
Warner had been adamant before the series that he would play him differently this year after falling to him seven times in 10 innings in 2019, and nowhere near as defensively.
For the first 30 minutes on Saturday, Warner was patient. Australia played out the opening three overs for maidens and Broad’s first 12 balls to Warner were dots.
Then on the 13th delivery Warner saw a wide ball outside off stump, went hard at it, and dragged it back onto his own stumps.
After scores of 43 and one in the World Test Championship final, the time is ticking on the 36-year-old Warner.
He needs runs to fulfil his hopes of an SCG retirement against Pakistan in January, after outlining that as his planned exit from Test cricket at the start of the tour.
After Warner went, Broad spent a minute trying to rouse the Hollies Stand to roar even louder before he ran in at Labuschagne.
He brought them immediately to life, setting up Labuschagne with a legside field set and drawing his outside edge with a ball that swung away as the right-hander felt forward for it.
England have made a clear in this Test that Bazball is about more than just attacking strokeplay.
They continued their penchant for declaring early when they sent Australia in late on day one, and had part-time medium-pacer Harry Brook bowl the 15th over on Saturday.
Ben Stokes employed two leg slips for Smith from the moment he came to the crease, while they used a catching forward point and short cover for Khawaja.