Hi Derek
I've checked several other Volvo parts outfits on the Continent and they all mention that wheel cylinder bore size depends on whether a servo is fitted (1" no servo, 7/8" with a servo). I looked through the "Green Service Books" for my 68 1800S and for my 131 and I can't find any mention either.
The parts book list a brake valve (671894-4) which covers chassis numbers 193800 to 225049. Mine is 199984 so that fits. But I cant seem to find any thing that states difference bore size if a PRV is fitted. I'm guessing that all servo cars had a PRV and therefore should have the 7/8" cylinder. What I really want is something in a manual that says non-servo cars but with a PRV should also have the 7/8" bore cylinders.
Might try to call Simon at Brookhouse and see what he says.
Phil
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