Hi there, I just want to share this story I have had with my ABS hydro unit in case anyone else is having similar issues.
I had a yellow ABS light appear on my dash. I asked my mechanic mate about it and he said 9/10 times, a hydraulic pump unit replacement will do the job and rectify the warning light.
I thought I would chance my arm and look for a 2nd hand part (part no: 3451-6771486-01) and after an exhaustive search of part yards, I found one for Ä250. I decided to just cross check that price vís a new one from the dealer and to my surprise, I located a brand new one for only Ä278, so it was a no brainer to go for a new vís the 2nd hand one, for such a small price increase.
I am going to have this fitted in a couple of weeks (wife having a baby any day soon!) so will post back here and let you know if that did the job or not.
Owner of a 2005 BMW 320D E90