A man broke into a Brooklyn business and attacked the owner and his two sons — but was killed when the threesome pinned him to the ground to subdue him, police said.

The 36-year-old business owner and his 15- and 17-year-old sons live next to Vision Car Service on Bushwick Ave. and heard the break in about 6 a.m. Sunday. They went to investigate and the man threatened to stab them. They then pinned him to the ground and called 911. When cops arrived, the man was unconscious.

An EMS crew transported the man to Woodhull Hospital, where he was declared dead at 6:40 a.m.

The man never displayed a knife, cops said.

Police said they didn’t expect there to be charges, but the cause of death was pending an autopsy.