72 GS455 brake proportion valve

Discussion in 'The whoa and the sway.' started by 71gs3504sp, Aug 2, 2019.

  1. 71gs3504sp

    71gs3504sp Well-Known Member

    Working on replacing brake hard lines at the proportion valve and due to rust at the rear brake outlet I snapped the rear brake line. BTW I knew that I was replacing the line anyway. When I removed the brake nut at the rear brake outlet the large nut also came out since the brake nut was so rusted on. Now my question is when I removed the large nut there was a rubber seal between the large nut and proportion valve. If you see in the image below, at the outlet to rear brake location you see a black image on top and bottom which is the rubber seal. Where can I get this or should I replace the whole valve?
    CombinationValve.JPG
     
  2. gstewart

    gstewart Well-Known Member

    I think that u can purchase a rebuild kit.
     
  3. gstewart

    gstewart Well-Known Member

  4. 71gs3504sp

    71gs3504sp Well-Known Member

    Gerry thanks for the information but my brake proportional valve doesn't really look like the one for the rebuild kit. As I stated above it has a large nut on for the rear brake line with a seal/o-ring.
     
  5. 71gs3504sp

    71gs3504sp Well-Known Member

    Guys I found out this is a bendix 0411 proportion valve for our 71 on Buicks.

    Seem there are no rebuild kits available, I truly don't want to replace it just because of one seal.

    Trying to keep it as stock as possible.

    So the question is ANYONE every replace this seal on the rear brake line large nut or do I need to replace it with a brass replacement.

    Please let me know.
     
  6. gstewart

    gstewart Well-Known Member

    U have Bendix. I understand. U may have to buy a new unit. That may be money well spent.
     
  7. 71gs3504sp

    71gs3504sp Well-Known Member

    Gerry will do thanks!
     

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