Question on R50 Power Steering Carbon Brush

[Joerg72]

Hello,

first: THANKS for the great description on replacing the power steering pump. That was a big help!

Now I have it removed, find a lot of dust in there and want to replace the carbon brushes. The manufacturer ZF Steering Systems is partially owned by Bosch, so I suspect that the 4 carbon brushes are parts that follow a Bosch Spec but haven't found any reference to this.

Does anybody know e.g. a Bosch part number or other specification that I could use to get replacement carbon brushes?

THANKS much in advance