Thanks Mercmad for an excellent procedure, I'm hoping the accumulator is good, as it seems as if I can only get it from the benz dealer over here, none of my usual german car specialists carry them, so it'll be expensive!
The parts guy will probably end up telling me that I have to buy the whole assembly under the car, the pump, filter, accu etc...
I dont know what its like in the US with older Benz cars at the main stealer, but over here in the UK, they dont want to even try to help you.

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i