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The brake hoses do go bad. They are probably due for a change if it hasn't been done recently, and could cause slight pulling.
The symptoms happened over a short period of time, and I'm going to suspect the phase "all the way to the floor".
When the piston in the master cylinder is fully extended, it sweeps over rough/rusted areas in the bore which tears the internal seal.
It might be necessary to bleed the brakes some more to see if that helps. It sometimes takes a while.
If that doesn't help, then a MC replacement might be necessary. Pre-bleed it by cutting and wrapping a brake line back into the resevoir and pump it through several times.
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