This relates to
the Brapwagon, a '92 245 GLE with a TRW rack.
When turning the wheel, the power steering assist doesn't seem to kick in right away. I have to pull the wheel a few degrees, and then assistance kicks in and it turns freely. This only happens when starting to turn the wheel, or changing the direction of turn.
I have flushed the power steering system pretty thoroughly, and turned lock to lock a bunch of times in an effort to release any remaining air in the system, but that doesn't seem to have made a difference.