One more note for those who attempt to adjust/pull the IP on a W115 chassis 240D:

I was able to access the 3rd bolt at the bottom of the pump by pulling the driver's side wheel. From there I used a 13mm socket with a universal joint and an extension. You can just reach it from the wheel well between the steering gear (pointed straight ahead)--way easier than trying to wrangle it unseen from the top or bottom using the 90 Degree wrench.