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    Thread: Found! CIS Brake Booster check valve

    1. Member teknikALLEN's Avatar
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      10-01-2013 03:02 PM #1
      I cracked this sucker two years ago and "fixed" it with some silicon. I have had a variable idle ever since...

      I finally found what appears to be an exact replacement with the small port for the HVAC. Even manufactured in Germany.

      AC Delco part # 90304535.

      Last edited by teknikALLEN; 10-01-2013 at 03:02 PM. Reason: Picture
      Quote Originally Posted by briano1234 View Post
      I would rather do a 3 rear cables than a passenger side motor mount.
      020ld for this stuff... a clutch and 5th gear conversation with Broke VW

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    2. Member rabbitnothopper's Avatar
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      10-01-2013 07:22 PM #2
      yeah strange that VW parts sellers cant figure it out

    3. Member teknikALLEN's Avatar
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      10-01-2013 09:12 PM #3
      It has a GM part # too. Used on some Cadillacs I believe.

      It was crazy no one has posted this before.
      Quote Originally Posted by briano1234 View Post
      I would rather do a 3 rear cables than a passenger side motor mount.
      020ld for this stuff... a clutch and 5th gear conversation with Broke VW

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    4. Member briano1234's Avatar
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      10-01-2013 11:04 PM #4
      Now thanks to you when the CRACK pipe gets broken, we can use a new part to re-make the hose...
      WELL Done.
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      Another Useless Ground Thread
      HAVE YOU CHECKED THE FAQ's ABOVE..PAGE 3 Thread 75? Why bother no one else does.
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    5. Member flipty's Avatar
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      10-03-2013 02:05 PM #5
      anyone care to quickly explain what this one does, and why a brake booster would affect idle? Every time I see a cheap part like this I feel like buying it and replacing the one I have because it's sure to eventually fail.

    6. Member Moltenburn's Avatar
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      10-03-2013 03:33 PM #6
      2nd on Flipty's ??? and Any chance we can have Kam add this to Cabby-info?

    7. Member briano1234's Avatar
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      10-03-2013 06:43 PM #7
      That is the vacuum check valve that in attached to the hard plastic (CRACK) line, the line breaks and leaks vacuum. It powers the brake booster, and remember class Any Vacuum leak on the cabby is a bad thing and causes all kinds of mischief.

      That check valve also contains the 2 vacuum off shoots that get man handled and broken also.
      Having one when you break the line at 2:30 in the morning.... well that is a good thing.
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      Another Useless Ground Thread
      HAVE YOU CHECKED THE FAQ's ABOVE..PAGE 3 Thread 75? Why bother no one else does.
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    8. Member Kevin Rowley's Avatar
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      10-03-2013 07:52 PM #8
      $10 on Rock Auto. Buy 2. Replace the one in the car and keep the other in the box of spares in your garage. (You DO have a box of spares, don't you?)
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    9. Member flipty's Avatar
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      10-03-2013 11:03 PM #9
      Looking under my hood tonight I saw a valve that looks exactly like that, but it was going into the front of the air intake manifold. Mine is CRUSTY and looks like it's going to turn to dust. Is that the one?



      That one?

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      10-03-2013 11:26 PM #10
      Quote Originally Posted by Moltenburn View Post
      Any chance we can have Kam add this to Cabby-info?
      Made a note to add it (and Brian's brake clips) info with the next update ... which probably won't be for another 2 weeks 'cuz I'm busy with other stuff.
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    11. Member Moltenburn's Avatar
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      10-04-2013 10:22 AM #11
      Quote Originally Posted by kamzcab86 View Post
      Made a note to add it (and Brian's brake clips) info with the next update ... which probably won't be for another 2 weeks 'cuz I'm busy with other stuff.
      Cool and thank you. Future parts being categorized to avoid future headaches

    12. Member flipty's Avatar
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      10-10-2013 02:52 PM #12
      I got my new valve in the mail, and I am going to install it, but I figured this would be a good time to ask about the following questions....



      the blue arrow points to..... what IS that thing, and what good can it possibly do sitting there on its own? Does it vent vacuum or something? Is it a sensor of some sort?

      The green arrow, I know what that is, but it was already in my image...so never mind that one.

      The RED arrow, that's some sort of a right-angle adapter monstrosity, is it not? that line is a Frankenstein of several different diameters of vacuum line and that thing that looks like a check valve, but is what... just an adapter? If that's just an adapter of some sort I'd love to replace that whole line to the brake booster with just a single brand new vacuum line.

      Any idears?

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      10-10-2013 09:32 PM #13
      Red arrow: yep, a monster of an adapter. The factory piece was a hard, molded plastic pipe that was shrunk over the check valve at one end, and a different plastic nozzle on the other end, which pressed into a grommet on the booster.

    14. Member flipty's Avatar
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      10-11-2013 01:21 PM #14
      Does anyone happen to know the ID on both sides of that hose so I can get the right piece(s)?

    15. Member rabbitnothopper's Avatar
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      10-11-2013 07:47 PM #15
      Quote Originally Posted by flipty View Post
      I got my new valve in the mail, and I am going to install it, but I figured this would be a good time to ask about the following questions....



      the blue arrow points to..... what IS that thing, and what good can it possibly do sitting there on its own? Does it vent vacuum or something? Is it a sensor of some sort?

      The green arrow, I know what that is, but it was already in my image...so never mind that one.

      The RED arrow, that's some sort of a right-angle adapter monstrosity, is it not? that line is a Frankenstein of several different diameters of vacuum line and that thing that looks like a check valve, but is what... just an adapter? If that's just an adapter of some sort I'd love to replace that whole line to the brake booster with just a single brand new vacuum line.

      Any idears?


      actually the red arrow device comes on new vacuum assisted brake boosters
      typically your hose goes into the brake booster with a straight valve
      instead remans shove a 90*degree one way valve in there for you
      and it explicitly says on the label "Do not remove"....


      i have seen the blue arrow before
      but i dont know what it is really
      apparently it is an electronic valve that syphons vacuum...probally an idle or wot adjuster
      Last edited by rabbitnothopper; 10-11-2013 at 07:50 PM.

    16. Member flipty's Avatar
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      10-11-2013 09:17 PM #16
      I guess I should ask then... how much stock would I put on "do not remove"? If it's just a passthru elbow, I'm either going to remove it or use two lengths of hose to have that clean 90* turn. I am just very sketchy about the hose sections that are directly connected to other hose sections, and are starting to show signs of cracking.

    17. Member teknikALLEN's Avatar
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      10-13-2013 10:19 PM #17
      I believe the blue arrow is the Up-shift indicator vacuum switch. It relays engine load to the up-shift control unit and is connected to vacuum line to/from distributor usually to the Throttle body. I normally see that closer to the distributer rather than the TB.
      http://www.cabby-info.com/electrical.htm#Sensors
      Quote Originally Posted by briano1234 View Post
      I would rather do a 3 rear cables than a passenger side motor mount.
      020ld for this stuff... a clutch and 5th gear conversation with Broke VW

      My MkI & Cabby WTB Wish List
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    18. Member flipty's Avatar
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      10-14-2013 01:51 AM #18
      I have an 88... so while my instrument cluster has the shift indicator, I believe it doesn't actually have the hardware. I looked it up in my Bentley and it claimed to be something else but for the life of me I can't remember. Something to do with idle boost or something.

    19. Member phish32786's Avatar
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      10-14-2013 09:38 AM #19
      Blue arrow is the cold enrichment vacuum switch.

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    20. Member flipty's Avatar
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      10-15-2013 11:14 AM #20
      I posted this in another related thread but wanted to post it here too just in case...

      anyone know where I can get a replacement for that switch? I'm reasonably certain mine's toast.

    21. 10-17-2014 10:49 AM #21
      I'm fairly certain it was used on some Opels, as they where gm vehicles made in germany.

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      04-04-2016 10:10 PM #22
      Does any one have a recent source for the AC Delco # 90304535 check valve?

    23. Member briano1234's Avatar
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      04-04-2016 10:24 PM #23
      Quote Originally Posted by N1ch View Post
      Does any one have a recent source for the AC Delco # 90304535 check valve?
      Google?

      https://www.google.com/search?q=9030...utf-8&oe=utf-8
      Grounds, Grounds, Grounds Replace them things.
      Divorces, Great Coffee, and Electrics, all start with GOOD Grounds.

      Another Useless Ground Thread
      HAVE YOU CHECKED THE FAQ's ABOVE..PAGE 3 Thread 75? Why bother no one else does.
      You can lead a user to a link, but you can't make them click.

    24. n00b
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      04-04-2016 10:54 PM #24
      Quote Originally Posted by briano1234 View Post

      Comes up as no parts found for some reason...

    25. Member Kevin Rowley's Avatar
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      04-05-2016 10:43 AM #25
      Quote Originally Posted by flat4tom View Post
      Comes up as no parts found for some reason...
      Try here:

      http://www.wholesalegmpartsonline.co.../90304535.html
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