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Load sensing brake proportioning valve?

Discussion in '1st Gen. Tacomas (1995-2004)' started by CdnSldr, Feb 2, 2011.

  1. Feb 2, 2011 at 5:15 PM
    #1
    CdnSldr

    CdnSldr [OP] Well-Known Member

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    My BPV is rusted to shit and no longer functioning. When I squeeze the rubber boot I can hear the rust crunching. (Thankyou Northern Ontario for 15 years of salt filled winters!)

    I am wondering where I can find one of these valves. Ive searched all of the popular online auto parts stores and have found nothing. Toyota wants about $300 for one of these from the dealer! :eek:

    Ive check the local scrap yards and all the ones I found are in just as bad shape as mine.

    let me know if any of you guys have dealt with replacing yours. thanks all!

    [​IMG]
     
  2. Feb 2, 2011 at 6:31 PM
    #2
    2000SIG

    2000SIG Well-Known Member

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    I had the same situation last week with my 2004.One of the tech at the Gm dealer that I work for fix this for me.He removed the dust boot, took it apart and clean it.Once all the rust was gone he sprayed some rust inhibitor paint inside.Put back tpgether and it works just like a new one.Total cost 100$/2.3h labour.

    hope this help

    Marc
     
  3. Feb 3, 2011 at 10:32 AM
    #3
    Di Trut

    Di Trut Well-Known Member

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  4. Feb 3, 2011 at 11:48 AM
    #4
    Janster

    Janster Old & Forgetful

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  5. Feb 3, 2011 at 1:19 PM
    #5
    Di Trut

    Di Trut Well-Known Member

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    Well, it's a manual valve so if you wanted to change the distribution you just turn the knob to whatever balance you would like.
     
  6. Feb 3, 2011 at 4:11 PM
    #6
    Janster

    Janster Old & Forgetful

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    It is adjustable ...but once you set it, its SET. No day to day adjustments unless you craw underneath and adjust it youself.

    The BPV on the rear axle of the tacoma (1st gens) adjusts based on how much weight is in the bed. There's a bar attached to the axle that goes up to the BPV. If you put 1000lbs in the bed, the bar will pivot inside the BPV to automatically adjust the braking pressure at that moment. Once you remove the weight from the bed, it automatically re-adjusts again.
     
  7. Feb 3, 2011 at 4:12 PM
    #7
    Janster

    Janster Old & Forgetful

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    Have you tried ebay or craiglist? Junkyards... Used car parts, etc?
     
  8. Feb 4, 2011 at 12:04 AM
    #8
    Trifenix

    Trifenix Well-Known Member

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    I don't think mine really works anymore. I can't tell the difference when it is working and when it isn't. Tempted to remove it.
     
  9. Feb 4, 2011 at 5:31 AM
    #9
    Space Wrangler

    Space Wrangler Well-Known Member

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    they do make an 'in cab' adjustable bpv. ..but i've only seen it used on race cars/trucks. ..i assume it's prohibitively expensive.
     
  10. Feb 4, 2011 at 10:03 AM
    #10
    Di Trut

    Di Trut Well-Known Member

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    I know exactly how the system works, thanks. And it's not too hard turn the knob to adjust balance when you have a heavy load in the bed, which isn't all that often for most people.

    Depending on what a new lspv costs, it might be worth the extra hassle.

    http://www.tacomaworld.com/out.php?...&part=SUM-G3905&N=700+-48578+115&autoview=sku

    something like this one. you just have to run the lines through the cab.
     
  11. Feb 6, 2011 at 1:02 PM
    #11
    CdnSldr

    CdnSldr [OP] Well-Known Member

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    New lspv's are worth about $300 new from Toyota! :O
     
  12. Jun 22, 2011 at 4:24 AM
    #12
    james

    james In over my head...

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    What activates it? The angle the rear end tilts? Something more sophisticated? I put double that weight in/on my truck three weeks ago, but compensated with air bags back there so that the truck ran level. Did the valve sense it anyway?
     
  13. Jun 22, 2011 at 4:28 AM
    #13
    Janster

    Janster Old & Forgetful

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    Yes..whatever angle the rear tilts.

    Since you've compensated with airbags ( and made the truck level again) - you've defeated the BPV in doing its job to compensate for the weight (basically).
     
  14. Jun 22, 2011 at 4:38 AM
    #14
    james

    james In over my head...

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    Huh... Learned something. Thanks, Janster. And thanks for the quick reply.
     
  15. Aug 5, 2012 at 12:12 PM
    #15
    stumpsterj

    stumpsterj New Member

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    I read your article. The proportioning valve was leaking badly. New part was $200.00. My dad pulled the valve out, cleaned it thoroughly and put it back together. It is good as new and didnt cost anything except a can of parts cleaner. Thanks for the POST. I own a 1996 Tacoma 4 cylinder and am at 295,000 miles and counting! Thanks again!!!
     
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