Hi Atlanta
I think it's much easier to find birth parents when you are the adopted person, than to find someone who was adopted.
I had a baby girl in 1960 who was adopted privately - I worried for years about that - but finally she found me and the adoption had been a success. She got her original birth certificate, then having got my name, searched for a marriage and any children I might have had, and then checked addresses etc. She did come to a halt as we had moved so many times, but as we have a son with an unusual Christian name, her father looked on the electoral roll and there were only 4 in England with that Christian name and the correct surname. They were going to contact them all, but struck lucky with the first one who was my son. He gave them my address (he was just told that it was a genealogist researching family history) and the rest, as they say is history.
Obviously, it's not possible for you to do that, as you haven't got your brother's adopted name and you are not entitled to see his adoption papers.
Good luck anyway in your search.
Lizzie