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abs is a control system. the fluid and lines are still the same.
try using 4 pairs of plastic pliers and clamp off each wheel at the brake hose. then try the pedal with the engine running and see if the pedal still drops. if it does, it is either the master cylinder or air in the lines. if it does not, then release one pair of pliers at a time until the pedal sinks. it will tell you the wheel that has the issue. it could be a hose, caliper or frozen slides
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