Hello everybody, I have a 70's folding bike with a Sachs coaster brake that stopped working, and instead will just lock or hop almost as your trying to brake. I was going to just try and take it apart but there aren't any hex nuts or grooves for a wrench on either side. There are two indentations on the brake arm side of the hub where I presume you could use a spanner but man, that might suck trying to use one.

Once I do figure out how to dismantle it, would just regreasing the hub be enough? Or does it sound like there could be permanent damage? Any ideas or insight are appreciated.

Thanks