Newbie here. Very thankful to be a member! I have learned an enormous amount of info about my car from the posts.
The 4-Matic light is on constantly in my 92 300TE 4-Matic. It is now in test mode, but I've had a knocking noise in the rear when backing up. The hydraulic oil reservoir was empty, and I looked at the pump only to find it covered with oil, along with the surrounding area. I have refilled the res with MB hydraulic oil - expecting it to leak and empty again.
Would you assume the pump is shot? What can be done besides buying another pump? Because of the knocking noise when reversing, is the transfer case in trouble too?
Lastly, what should I do now that the reservoir is full again after being empty for who knows how long? I probably need to bleed the system but am unsure how.
Thanks for the help