Chaos erupted in a Brooklyn courtroom Tuesday when the younger brother of an NYPD officer killed in a fiery motorcycle crash lunged at a relative of the truck driver charged with fleeing the deadly wreck, law enforcement sources said.

The melee broke out at the Brooklyn Supreme Court arraignment of Carlos Almanzar Toribio, who’s charged with leaving the scene of the crash on the Brooklyn-Queens Expressway that killed off-duty cop Jay Pena, 30, on Aug. 27.

Pena’s brother lunged at one of Almanzar Toribio’s relatives in the audience at the end of the proceeding, sources said, and in the ensuing mayhem, an on-duty NYPD lieutenant suffered a mild head injury.

Medics took away that officer, who was bleeding from the back of his head. The suspect’s relative could also be seen complainin

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