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Comment by OptionOfT

1 day ago

Can't get lane assist with hydraulic. That's why. I miss the hydraulic steering from the E93 M3.

Can.

Googling for C-MDPS reveals some instructive diagrams, wherein: The motor that applies force to the steering system is mounted on the steering column shaft. It supplies steering input in a manner like one's hands do.

Since all it does is turn the shaft, it works fine with belt-driven hydraulic-assisted power steering racks (or any other kind).