Rear end problem!!

Hi i hope somebody can help me coz i know a little but not alot about the brakes of my 1960 beetle but recently when i put the brakes on it starts (and continues untill i stop braking) with this big woosh woosh woosh sound like brakes clamping together n scrapping or something like they might be slipping. it also happens when i put the hand brake on???
Its there a little bit when i drive along then it will clink and clatter and then stop and both the brakes and driving it will be gone onluy for a few k's and soon starts up again though.

Anyway thats the best i can explain it if anybody has any advice it would be much appreciated.

Thanks everybody 🙂

ajust the brakes by turning the star nuts

Could be one of the following:
Shoes out of adjustment - adjust shoes
Drums out of round - have drums machined
Shoes or some part of brake assembly not in correct position - remove drums and check everything is in the right place.

thanks for advise, so took wheels off ,looked at adjustment starts but think my springs have come off insdie the drum but dont ahve rattle gun to remove drums so will have to wait till sat n see. cheers