Rank amateur here, so please excuse my ignorance: I have a standard ´92 MB190E 2,3 with no extras. The hydraulic fluid reservoir (the one front right in the engine bay, next to the wiper fluid and coolant reservoirs) is empty. The lines are all rusted, and there is a leak somewhere. Other than the ASD light I have noticed no issues. Car drives like it always has. Question: Other than the ASD, what are the hydraulics for?