On a w210 and a w203 (with ASR/ESP) can you flush the system with a pressure bleeder? Or would this leave "stale" brake fluid within the (expensive) control valves that you are trying to protect?

I'd like to think I can flush my own brake fluid (once out of the 4 yr mb maint agreement), but I suspect it is necessary to activate these valves while flushing in order to get ALL the fluid changed.

Thanks ...

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2001 e320 wagon
2004 F350
2006 Crown Vic