I agree with Larry; high probability of hydraulic problem.

The problem will be that the column of fluid between the master and slave cylinders has been shortened. Bleeding is what is necessary, but the master cylinder is often the problem. Bleeding only extends the column of fluid if all cylinders are sprung to their realesed state. There are some cars that are always problems the MB isn't one in that year (the old 110 chassis was hard).

There are bleeding devices that improve results. One such method is to pressure bleed in the reverse direction. This tends to increase the length and has to drive the master cylinder piston all the way in order to flow. Pressure bleeding in the flow direction can be done without getting the master cylinder piston into the return position. When this happens the column doesn't lengthen.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician