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Hello,
I had the same problem on my 135i.
I suspect it was the stuck brush problem inside the pump.
I sent the ABS/DSC unit to an ABS repair company, i paid something like 450 EUR with a 12 months guarantee, no coding needed, and it tooks like 10 days in total to send it and get it back.
I couldn't drive the car without the ABS/DSC unit, when i got back the unit, i reinstalled it, and drove the car very slowly using the handbrake to a shop to make a full brake liquid flushing with the ABS procedure (you can do it with INPA).
The procedure costed me something like 100EUR.
Good luck
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