He was born the oldest son of a Jewish family in Łódź, Poland. His father was a timber wholesaler. Brauner attended a general education liceum in Łódź, where he took the matura final exam, and then studied at a local polytechnic technical school until the German attack on Poland in September 1939.
He was born as the eldest child of a Jewish family in Łódź, Poland. His father worked as a timber merchant. Brauner attended a general education high school in Łódź, where he took the matriculation final exam, and then studied at a local technical institute until the German invasion of Poland in September 1939.