you can junk the servo and fit a master cylinder from another taunus, but get the whole master cylinder nad actuating rod so it will connect to your brake pedal.

doing this will make the brakes either harder to press, or the pedal go down further or both depending on the size of the master cylinder.

if the pedal is too hard to press, you can add an inline booster that were used on some old fords, but i wouldn't bother. just get used to having a hard brake pedal. it can be funny if you have a modern car with featherlight brakes and you swap between the 2 often and either end up not stopping in the old one or going through the windscreen of the new one