I have read that sometimes the two man bleeding technique can push the MC piston past where it has "worn in" to a region where the bore of the MC can be corroded, so that you create an internal leak. Long shot and hard to check, I know.

Best bleeding method is a Motive Power pressure bleeder, IMHO. You can DIY and get a good bleed pretty easily.

Rgds,
Chris W.
'95 E300D, 391K

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