'72 Scamp Can I just fix the front brakes to get it home?

Let me add there is a red flag in what you wrote.
It reveals someone made some weird modification to the '72 or you didn't open the MC cover.

there's many variations on braking systems. there's no such division as 'modern' or 'old'. Basic principles are the same, mechanically and hydraulics lots of variations. Some minor, some major.

In addition to the service manual, mymopar has many of the Master Technicians Conference booklets and A/V.
Well worth the time spent with both the principles and the specific tips.
A better index for the MTSC is here
Master Technician Service Conference - Chrysler's Training for Mechanics