Sent a customer home with a bad brake master cylinder, still second-guessing my call

Last Tuesday in my shop near Tulsa, a guy brought in a 2012 F-150 with a soft pedal and no visible leaks, so I bench bled the new master cylinder and replaced it, but the pedal still sinks to the floor after a few pumps. I told him it needs a full ABS module bleed at the dealer, but now I wonder if I missed a failing brake hose that only expands under pressure. Has anyone else dealt with a scenario where the master cylinder swap doesn't fix the pedal and you have to go back to basics on the whole system?

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