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<x-charset iso-8859-1>You're quite right Henrik. My '58 version of the VW Workshop Manual does indeed mention a check valve, and explains that it is used to ensure a fresh charge of fluid is drawn into the M/C during bleeding (and presumably 'pumping' too). Because there couldn't be any residual pressure in the tandem M/C, the Type 3 outlet drillings were reduced in size to allow pumping of the master cylinder (it says in my Factory Type 3 Workshop Manual). Ah yes, there is a Specialitzen Bodenventil (or something - can't move all those boxes again to get to the manuals); M/Cs have a blue label on them to this effect. So now we all know! Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org </x-charset>