The 560SEC has gone in for some work this week that should have a number of issues fixed.
1) Front calipers rebuilt and rotors changed over.
2) Will check rears while he is there, I have rebuild kits available for the rears should they be needed. Given rears gum up more that fronts, I think the chances are reasonable they will need it.
3) Major power steering leak - I suspect box may have to come out to be re-sealed. Supplied a steering coupler if it does, might as well change while there.
4) A/C can't keep a charge, blacklight shows a lot of leakage around the compressor. have supplied a new compressor, tx valve, drier. Also trying the klima kit upgraded condenser for better AC performance on R134A. I like ICE COLD AC.