69 Barracuda 318, brake pedal sags

AJ/FormS said

Solved for now!
What happens if a brakeline bursts? and you run out of pedal before the back-up system comes on line.

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Whoa .... it was an eighth of an inch of adjustment! I swapped from drum to discs which required a different master cylinder; which required an adapter. So, yeah, solved forever.