I cant get under the car yet because we dont have the right kind of jack. I did take some pictures though. I cant tell if the disc is bad from the pictures. I will post what I have so far. He also did tell me he sometimes would hear a small thud when making slow right turns. I saw some oil/grease on the axle but its not wet. He has a oil leak up front so I think that may just be accumulated oil/dirt that blew back over the years while driving. His front disc was changed 50 or 60k miles ago. I dont know if his rear disc was ever changed. It may have been. I think he is around 165k now

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1993 Benz-190E-2.6 liter