Thanks Stretch, today cleaned everything up after draining TC, total of around 5.5 liters drained so should stay clean for a while.

Spent an hour looking for small holes for the pin, nothing doing so positioned as above, it does have a click when pressure is applied so hopefully that's it's home.

Didn't really know what to do with B1 as no clear direction, ended up removing both internal springs and replacing with larger but softer spring from another piston.

Reset modulator, test drive..exact same although very crisp and responsive to kick down pressure.

It could be the modulator is shot, good vacuum elsewhere with everything working. Need to drop engine by removing mounts to access bolt (rounded off).

If this doesn't work will add to 'spring job list' ordering one of those multi spring kits Diesel Kit (Superior K722A-D ).

Cheers for the help

__________________
David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)