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The pedal going soft and to the floor is not what a failing brake booster should do, it should give you a very hard pedal (and increased pressured required on the pedal to brake effectively).
If the issue is in the brakes / fluid overheating due to dragging brakes you should be able to clearly smell the brakes. Also a quick walk around the car should reveal which corner it is as the heat can be felt easily.
ABS will not give you any issue with pedal pressure, so that shouldn't be your concern.
So I agree with the first reply to your post -> check the mechanical (/hydraulical) condition of your brakes.
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