IIRC the 1100 didnt even have a servo. The mk2 Polo was the same.
I'm not overly familiar with the petrol Golfs but the diesels all had servos.
My main experience with them is the commercial vehicle variations which had the 10.5" drums common to the Passat Estate and the Audi 80 so perhaps normal versions with the small drums weren't so good at stopping.
I believe early mkI Golfs had drums all round.