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.
Got the 560SEC back after a rebuilt steering box (was leaking) and the guide rod mount bushes. They actually looked alright, but the oil leak had been covering one of them and so It was recommended they were changed. I'm glad we did, as they had clearly been in since the car's time in the UK and were well past their use by date.