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When to adjust or move a the load sensing proportioning device?

Discussion in '1st Gen. Tacomas (1995-2004)' started by skycamper, Sep 1, 2021.

  1. Sep 1, 2021 at 10:33 PM
    #1
    skycamper

    skycamper [OP] Well-Known Member

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    3" Lift w/ 5100's and EMU 882 springs , General Leaf Spring and AAL in rear with 5100. Diff drop, carrier drop, 3 degee axle shims. Trail Gear Tube Bumper. Tundra brake mod.
    My new leaf springs really jacked up my back end since the old ones were completely shot and wrapped. The springs were from General Spring and the HD versions. The difference was alot, im wondering if my back brakes were being engaged more since maybe the truck always thought there was a load back there? Now what?
     
  2. Sep 1, 2021 at 10:56 PM
    #2
    Laxtoy

    Laxtoy Dog is my backseat driver

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    When I bought my truck it had tall springs in the back to carry heavy loads. As a result the front springs were shot and the front brakes did like 90% of the braking.

    I did a combination of extending the bracket at the axle and bending the bar connected to the load sensing proportioning valve. The advice I got was to try to get the bar that goes between the valve and the bracket on the axle to semi level to the groundCBECB611-854C-445F-B487-0AD85FE0AEE1.jpg
     
  3. Sep 1, 2021 at 11:27 PM
    #3
    Kwikvette

    Kwikvette Well-Known Member Vendor

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    4 run, 2 don't
    Higher than stock, then make a little bracket to adjust for the added height -

    20190920_113647.jpg
     
  4. Sep 2, 2021 at 3:36 AM
    #4
    Rachelsdaddy

    Rachelsdaddy Well-Known Member

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    Like he said. I bought one on eBay w/ new bolts and the stand off tubes for 15 bucks or something. I don’t have time to find the link….
     
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    #4
    skycamper[OP] likes this.
  5. Sep 2, 2021 at 7:45 PM
    #5
    Loober

    Loober Well-Known Member

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    have you considered removing it all together?
     
  6. Sep 2, 2021 at 10:25 PM
    #6
    skycamper

    skycamper [OP] Well-Known Member

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    3" Lift w/ 5100's and EMU 882 springs , General Leaf Spring and AAL in rear with 5100. Diff drop, carrier drop, 3 degee axle shims. Trail Gear Tube Bumper. Tundra brake mod.
    What happens if I did that? How would the brakes work then?
     
  7. Sep 3, 2021 at 2:05 AM
    #7
    USMILRET

    USMILRET Tacoma Owner

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    When the level of the bed gets lower due to a heavier load the rear brake proportioning valve should increase the volume of brake fluid to the rear drums. This helps to divide the stopping power should the load increase.
     
  8. Sep 3, 2021 at 2:35 AM
    #8
    USMILRET

    USMILRET Tacoma Owner

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    In theory you could manipulate/ bend the bar to increase or decrease rear braking.
     
  9. Sep 3, 2021 at 7:24 AM
    #9
    Loober

    Loober Well-Known Member

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    Best is to eliminate it and use a proportioning valve to adjust it to your liking.
     
    Bivouac and Wulf like this.
  10. Sep 5, 2021 at 9:13 PM
    #10
    skycamper

    skycamper [OP] Well-Known Member

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    2001 Tacoma 4x4 2.7L Ext Cab
    3" Lift w/ 5100's and EMU 882 springs , General Leaf Spring and AAL in rear with 5100. Diff drop, carrier drop, 3 degee axle shims. Trail Gear Tube Bumper. Tundra brake mod.
    This seems like a good solution. Im not sure if I have the stones to be bending brake lines. Is there a valve you use and like?
     
  11. Sep 5, 2021 at 9:59 PM
    #11
    Loober

    Loober Well-Known Member

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    Yea, you will need a proportioning valve. I'll try to find a link to a write up about it.
     
  12. Sep 6, 2021 at 9:36 AM
    #12
    Bivouac

    Bivouac Well-Known Member

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    Remains to be seen I bought the tires and wheels the rest came along
    With my Toyota 4x4`s being so old I never had a LSPV that ever worked .

    Learning to drive without any was not that hard just know the rear brakes will lock on wet roads when empty on hard applications like in my misguided youth..

    I replaced a few with manual valves some I just removed from the system just a matter of getting used to things
     
  13. Sep 6, 2021 at 10:08 AM
    #13
    04tacoma trd

    04tacoma trd Well-Known Member

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    Horrible advice. OP - if you lifted your truck, either fab or purchase a bracket to raise it up where it mounts to the rear axle. If your truck is stock and you are having rear brake issues, crack open your factory service manual and troubleshoot the thing. (You have a service/shop manual, right?)
     

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