I have, to date, received approx $1000 of the $5000 owed, as a result of a couple of cash payments and an automatic payment he set up last year. At the current rate, I'm looking at another 3-4 years.
I agree with those who said that, if you want to maintain a relationship with your brother, at this point you have to just live with the automatic payments he's making. And in the future, if you want and can afford to help a friend or relative, give
them money. Don't lend it. I learned the hard way, too, though on a smaller scale than you.