The noise on the video sounds exactly like the counter squealing (as I already suggested). It's a very common problem that I have observed many times in A77 decks. During fast wind, the brake bands do not touch the brake hubs (or they should not). If the band is rubbing the hub during fast wind, you should fix that.
The brake hub material does not "wear out". As I stated before, the original glue for the hub cloth migrates to the surface and can make the hubs sticky. That would cause other defects, however.
Also, when you removed the brake band, did you also remove the counter belt?