I was looking on the WIS for mercedes about replacing the brakes on my S320, and it mentioned in one section that if rotors are badly corroded, you could use a brake rotor cleaning pad to clean the rotors...
According to the instructions, you could do the fronts one side at a time, and the rears both at the same time if the fronts were in... Once you put the cleaning pad in, you drive about 30 km/h for a few hundred feet with the brakes somewhat applied... And check, and repeat till the rust is gone...
Does anyone know where such pieces of equipment are available??

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic