1973 Dart brake failiure
Popped the cover off, there is still brake fluid in the two ports but the back one is significantly lower, is this normal?
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This actually is a regular maint. check, especially with disk brakes.
Assuming the back seals of the master are leaking the master needs to be removed. If the bore is good, then it needs new seals. If the bore is damaged then it can be sleeved by a shop.
Start soaking the flare nuts with a penetrating oil. Its going to take a lot of patiance to free the nuts and not twist the tubing. After soaking for several days or more, break them free a fraction of turn, then tighten, then loosen a fraction. Eventually it will turn without the tube turning with the nut.
My mechanic says heat can be used, carefully, but I haven't done it.
Remove fluid from the resevior first and bleed the brakes.
It needs fresh brake fluid anyway.