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Oddly enough, I found out that it is a brake booster. http://www.emercedesbenz.com/Jun06/29_New_T50_Brake_Booster_For_Classic_Mercedes_Released.html

Need help with this part. I have no idea what it is or what it does. It is on the passenger side engine compartment backed up to the firewall. It has 2 steel lines connected to it that are about...