How did you have your brake proportioning valve rod adusted?

Discussion in 'Suspension/Chassis' started by phatmitzu, Oct 15, 2008.

  1. phatmitzu

    phatmitzu Veteran

    Joined:
    Jul 9, 2007
    Messages:
    303
    Likes Received:
    2
    Location:
    SoCal 626
    Truck:
    93 Standard Cab 5spd
    I extended it downwards using a metal bracket that I've found. Now the tup of bar is only 3" off the ground...but I still get screeching noises from the rear whenever I brake. I'm thinking the rear brakes are still putting out too much pressure. How did you have yours adjusted? I tried to bend that mofo but it wont bend. :mad:
     
  2. ShoNuff

    ShoNuff Toyotaholic

    Joined:
    Oct 22, 2007
    Messages:
    1,559
    Likes Received:
    7
    Location:
    seattle
    Truck:
    75 hilux, 80 4x4
    define "screeching noises"


    do you mean the tires or the brakes?


    id check your pads.
     
  3. IronNam

    IronNam Grand Toyotaholic

    Joined:
    Sep 11, 2008
    Messages:
    6,960
    Likes Received:
    14
    Location:
    Kansas -> NorCal
    Truck:
    94 XCab
    comon Phat, you can do better!! heat and bend??
     
  4. smctoy

    smctoy Toyotaholic

    Joined:
    Nov 9, 2007
    Messages:
    1,731
    Likes Received:
    11
    Location:
    Florence, SC
    Truck:
    91 xcab...
    can you post some pics of what you did to the rear...im confused on what you need?
     
  5. DietoRemain

    DietoRemain Member

    Joined:
    Nov 26, 2007
    Messages:
    58
    Likes Received:
    0
    BPV? psh mines been T'd off forever I have full rear brake power lol. 99 tacoma btw. soudns like your drums need some work on them if they've never been repalced.
     
  6. phatmitzu

    phatmitzu Veteran

    Joined:
    Jul 9, 2007
    Messages:
    303
    Likes Received:
    2
    Location:
    SoCal 626
    Truck:
    93 Standard Cab 5spd
    I just checked the pads two weeks ago and it looked fine.
    I've attached some pictures I took with my phone. Do I have it angled enough?
     

    Attached Files:

    • a.jpg
      a.jpg
      File size:
      57.6 KB
      Views:
      239
    • b.jpg
      b.jpg
      File size:
      62.2 KB
      Views:
      269
  7. IronNam

    IronNam Grand Toyotaholic

    Joined:
    Sep 11, 2008
    Messages:
    6,960
    Likes Received:
    14
    Location:
    Kansas -> NorCal
    Truck:
    94 XCab
    that thing is so low id be nervous to drive that thing!
     
  8. Litneon

    Litneon Super Moderator Staff Member

    Joined:
    Mar 29, 2007
    Messages:
    2,414
    Likes Received:
    50
    Location:
    Cocoa, FL
    Truck:
    94 xtra cab
    The screeching noise, are your brakes in the rear locking up?

    It is most likely not your brake pads or rotors. Did you compare before and after heights of the LSPV lever? I'm guessing that you have, it looks close to where it should be. I would try it in a few more extreme places (all down, even all up) and see if you notice any change.

    It's not a great idea to just "T" the line and delete the LSPV without the use of a proportioning valve. With the rear drums getting full pressure, it is easy to lock up the rears, especially in a panic stop. Once the rears lock up, you will probably slide with the addition of any avoidance maneuver.
    I've done a few of these and never had a truck with rear drums respond well to full hydraulic pressure.
    While it will work, it just isn't "safe".
     
  9. lownloud

    lownloud Toyotaholic

    Joined:
    Nov 3, 2007
    Messages:
    1,535
    Likes Received:
    6
    Location:
    Plains, Montana
    Truck:
    1987 Toyota 2wd JT4RN50 Airbagged custom
    My understanding, is the further this rod lifts up, the less braking power applied to the drum brakes, therefore minimizing locking them up or wearing the pads out double fast. The further down the more power applied to brakes. If ya wanna do a feild test: Jack the truck frame up and put on jackstands so the rear tires are totally off the ground, then place a floorjack under the rear pumpkin and test braking throughtout different axle heights ( with bracket in stock postion ), I did this with mine and when I notched & bagged mine, I removed all but 2" of the rod and moved it to the top part of the notch and tightened it down when I found the SWEET SPOT, the idea of a tee was just not appealing to me, and best thing of all, I can change it out to a porportionating valve later. All in all mine works, cost me nothing and since I dont haul anything, the braking power is the same throughout the axle ranging. What you got going on scares me, I see Mcnasty bags and trolls getting hung up in that layout! Do the test itll solve your curiousity and learn a new trick man . . . Goodluck. . .
     
  10. phatmitzu

    phatmitzu Veteran

    Joined:
    Jul 9, 2007
    Messages:
    303
    Likes Received:
    2
    Location:
    SoCal 626
    Truck:
    93 Standard Cab 5spd
    Humm... so up is lose, and down is tighten..

    I'll test it out tonight.

    Thanks!
     
  11. IronNam

    IronNam Grand Toyotaholic

    Joined:
    Sep 11, 2008
    Messages:
    6,960
    Likes Received:
    14
    Location:
    Kansas -> NorCal
    Truck:
    94 XCab
    Hey Phatmitzu, have you figured out the LPSV stuff yet?

    i thought it was down means less because when you add load, it will go up and add more brake power.
     
  12. ShoNuff

    ShoNuff Toyotaholic

    Joined:
    Oct 22, 2007
    Messages:
    1,559
    Likes Received:
    7
    Location:
    seattle
    Truck:
    75 hilux, 80 4x4
    ya i think that was a typo.



    as the rod moves up it opens a spring loaded valve to allow more fluid flow to the rear.




    it looks like your geometry is off, the rod looks alot lower then it should be. ive never adjusted one before, so my best guess is to just relocate the whole original brack lower equal to the drop. that would keep the geometry right.
     
  13. planemos

    planemos Toyotaholic

    Joined:
    Jun 28, 2008
    Messages:
    1,025
    Likes Received:
    0
    Location:
    British Columbia
    Truck:
    92 2wd Xtra-Cab,98 2wd Xtra-Cab, 1988 Toyota Supra turbo
    lspv

    I believe wilwood has an adjustable valve. It is quite suitable for lowering situations like this one. (if you don't already know):)
     
  14. phatmitzu

    phatmitzu Veteran

    Joined:
    Jul 9, 2007
    Messages:
    303
    Likes Received:
    2
    Location:
    SoCal 626
    Truck:
    93 Standard Cab 5spd
    Yeah. For some reason the sound went away...so I just left it as it was.

    :lol:
     
  15. SD YOTA

    SD YOTA Grand Toyotaholic

    Joined:
    Jan 30, 2007
    Messages:
    3,585
    Likes Received:
    29
    Location:
    san diego
    Truck:
    2000 Toyota Tacoma 2wd
    holy crap dude........ if im being honest, that looks real scary to drive the way you got it set up there....

    you should just be able to flip the rod pivot upside down and let it pivot that way..... im not sure where in socal you are at but if you cruised down to san diego anytime soon i could help you set that up correctly. :waytogo:
     
  16. IronNam

    IronNam Grand Toyotaholic

    Joined:
    Sep 11, 2008
    Messages:
    6,960
    Likes Received:
    14
    Location:
    Kansas -> NorCal
    Truck:
    94 XCab
    mine is flipped upsidedown
     
  17. the_general626

    the_general626 Grand Toyotaholic

    Joined:
    Jan 13, 2009
    Messages:
    3,690
    Likes Received:
    0
    Location:
    La Mirada, CA
    Truck:
    90 Toyota Pickup 2wd standard cab
    so cal, 626 area code is a good 2-2.5 hrs away from sd
     

Share This Page