In a message dated 96-03-29 17:21:00 EST, snuggles@vnet.ibm.com writes:

>
>okay, been cruising round lately, me and rumba, doing great...then yesterday
>i
>notice a definite lack of power and my brakes are stiff. hmmm...maybe i hear
>a vaccum leak to..hmmm...okay, i've yet to track down the leak but i got
some
>new vacuum hose and will put that on shortly. question: what is the purpose
>of
>a one way vaccum valve? i have one that joins two seperate vaccum
>hoses..which
>is really one..but joined together by this one way vacuum valve. do these
>wear
>out? do they get clogged? i hear a leak under there..seems to be coming from
>this valve...any suggestions? on a side note, i cleaned the carb and put on
a
>new fuel filter, both were dirty and now we seem to run better.
>
>

The vacuum valve is needed to maintain a constant vacum supply in the brake
booster.  Since the manifold only has a high vacuum during idle,  vacuum
needs to be stored and 1/2 the volume of the brake booster is used for that
purpose.