I posted about my brake problem a while backhttp://www.classiczcars.com/forums/showthread.php?s=&threadid=7740 .

It was suggested that I should replace the vacum tubing. I did that and it still has the same problem. I am thinking I should just vacum test it - I will have a chance to do that later this evening.

If the check valve is bad, is there any shop that might carry it or do I need to go for Victoria British or MSA?

THanks!

MSA, VB or a Nissan dealer would be your best places to look. Highly likely that even if you find a dealer or another parts source, they would have to order it. Personally, I'd go with MSA, they will likely have it in stock and ship it out quicker.