Audi Repair Questions? Ask a Mechanic for Answers ASAP
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If the pedal is hard the accumulator (bomb) is bleeding down. If after starting the pedal gets softer, the pump is charging the accumulator. If it's bleeding down, and the accumulator is new, the steering fluid is likely contaminated.
I suggest you have the steering and brake system flushed. These are two parallel circuits driven off the same pump. If the accumulator still bleeds down it will likely require replacement.
Typically a failed accumulator will illuminate the light if you ht the pedal HARD. then you will feel the pulses of the pump assist the pedal.
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The sinking to the floor is most likely attributed to a failed brake master cylinder. This is the ONLY cause I have ever experienced or can imagine that would allow the pedal to sink that far.
The loss of assist is the accumulator bleeding down as there is likely contaminants in the internal check valve.