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Brake booster check valve 120-130

posted by  uncle_bagley on  Fri Aug 15 02:07 CST 2008
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last visit: Fri Oct 24 09:32 CST 2014
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Anyone know of a source for the brake booster check valve used on the '69 Amazon? I believe there were 2 different booster types provisioned by Volvo in that year. AFAIK the piece I'm looking for is p/n 678407. There is also an O ring with p/n 678440.

Thanks & cheers,
--
Barry -- 1967 122S 'Betty'








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    Brake booster check valve 120-130

    posted by  planetman on  Fri Aug 15 03:02 CST 2008
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    last visit: Fri Oct 24 09:29 CST 2014
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    Hello,

    Does it have 3 prongs on the backside of the valve that when inserted into the booster and turned, locks the check valve onto the booster?

    If yes, I have those in stock.
    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90501








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      Brake booster check valve 120-130

      posted by  uncle_bagley on  Fri Aug 15 04:16 CST 2008
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      last visit: Fri Oct 24 09:32 CST 2014
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      Hi Eric: Yes the valve has 3 equi-spaced prongs. Further, the distance from the valve seating surface to the far side of these prongs is ~7 mm and the diameter of that portion of the valve that inserts into the booster is ~22 mm. The overall diameter of the valve body is 1 ½”. It takes a 3/8” I.D. hose.

      Before we go any further, I like to ask a favor, which is for you to check the response characteristics of a new valve when going from higher manifold vacuum than booster vacuum to lower manifold vacuum to booster vacuum and vice versa. I suspect there is hysteresis or delay or something built in to prevent excessive valve rattling (which BTW is what we’re experiencing now) when the vacuum levels on both sides are ~ the same.

      I tested the one currently in the car by alternately blowing and sucking (no rude comments please) on the hose barb, and the response time was pressure sensitive, but it seemed to me that it took an excessively large pressure differential to “turn the valve around”. I recognize that this isn’t very good science, since I’ve really no idea of the pressure/suction levels I’m generating with this technique.

      Comments please. And price.

      Thanks,
      --
      Barry -- 1967 122S 'Betty'








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        Brake booster check valve 120-130

        posted by  planetman on  Mon Aug 18 13:40 CST 2008
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        last visit: Fri Oct 24 09:29 CST 2014
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        Hello,

        This is a check valve and the response should be instantanious.

        If you blow on the hose barb, you should be able to blow fairly easily to get the valve to open. As soon as you stop blowing the valve should close.
        --
        Eric
        Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
        Torrance, CA 90501








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          Brake booster check valve 120-130

          posted by  uncle_bagley on  Mon Aug 18 14:11 CST 2008
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          last visit: Fri Oct 24 09:32 CST 2014
          [RELATED]

          Well then the valve is clearly defective. Will the one you stock fit the dimensions I posted earlier and if so, how much?

          Thanks,
          --
          Barry -- 1967 122S 'Betty'







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