Colo, can't pick your family but you can pick your friends. If your brother doesn't want a relationship, that's on him. And I gotta say, if he'd given me those type responses, I would throw in the towel as well.
Life is too short to put up with family. Just because they were born doesn't mean that matters as much to us. I know close families but I know a lot more with dysfunction within them and the willingness for family members to forgive is a strange situation as well. While we would think being family should make that easier, it sometimes, has the opposite effect with the feeling it should have never happened because we are family.
That old saying blood is thicker than water applied to familial relationships is only partly true for me. The thickest blood runs through those I choose as family.
Then again if you are the one initiating this relationship, your brother could just be making this harder on you because in his mind he was righter than you. You've got to earn him back.
I have a friend that is a psychologist (No, I've never seen her professionally. I could see the wheels turning in the Pops thread, "Oh, I'm sure you know lots of them as they hand you off as a patient, sobbing and thinking of giving up the profession) and she specializes in family counseling. We've had discussions regarding one subject, the single most critical one to her profession, forgiveness. I had a steamer truck full of guilt on my back and she was aware of that and one time she just looked at me and said "until you can truly forgive yourself, you cannot truly forgive others" and that stuck with me and I cogitated on that and I believe I shared with my Pops family that after some real heart to heart with myself, gloves off, excuses forbidden, I was able to arrive at the point forgiving myself wasn't superficial.
None of my business but since you brought it here (and I am glad you feel comfortable doing that), I will offer some advice. If you truly want a relationship with your brother, a real one, you both need to address the elephant in the room, why you became estranged and most importantly, was so much damage done that forgiveness and moving forward isn't a reality? If it's going to be a just on the surface relationship, no sense in putting yourself through the frustration.