Vorderseite means front...
zurück apparently means back. Mmmm, still unsure.
Knowing what little I do about German they probably have a special word for 'Rear Brakes'.
... Like, Bremse hinten is this the H?
Still think I would rather have the smaller piston going to the front brakes. Unless of course somebody here knows otherwise?
Reminder; the brakes are Mk 3-4-5 Cortina, disk - drum; while the master cyl is BMW.