I just found out this morning, but it might have been that way for a looonnng time, as that sound from the rear wheels has been going on for a while now.

This morning, while investigating that noise and also trying to establish if I had a faulty bearing, I took off the rear right caliper, but the rotor was stuck to the hub as if it were bolted there... I tried playing around with the parking brake's adjusting starwheel, in order to free the rotor from the drum (I assumed that might be what was keeping the rotor stuck), but to no avail... the rotor does not move a single millimeter...

What am I to do at this point?

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1979 240D, W123, 105K miles, stick, white w/ tan interior.