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brake pro.valve and u-bolts

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by muddysub, Oct 14, 2001.

  1. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i put the lift on like 150mi ago and went to re-torque everything and i can't find the spec sheets for the u bolts. what are they supposed to be torqued to? (pro comp) and the goofy rear proportioning valve came loose and the nut is gone, do i really need to reconnect it? the thing has splines on it to connect the arm and the little valve thingy so it's hard to get back on. but if you turn the valve, it stays where you put it. do i really need this to be connected when i could just set it to give the rear end more braking power? if i need it i have to get the arm lengthened 4". is it worth it?

    donate to the "Build Scott's Suburban Foundation"
    scott,
    1989 GMC suburban 3/4t 4" lift soon to be rollin on 36" swampers, tbi350, th350, np241
     
  2. wayne

    wayne 3/4 ton status

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    Brake prop. valve I am not sure on but the u-bolts are 140 pounds.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  3. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    that high?! wow

    donate to the "Build Scott's Suburban Foundation"
    scott,
    1989 GMC suburban 3/4t 4" lift soon to be rollin on 36" swampers, tbi350, th350, np241
     
  4. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    that high?! wow!! anyone else on the valve?

    donate to the "Build Scott's Suburban Foundation"
    scott,
    1989 GMC suburban 3/4t 4" lift soon to be rollin on 36" swampers, tbi350, th350, np241
     
  5. wayne

    wayne 3/4 ton status

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    That is what my Haynes manual said.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    I've known a few people that have disconnected that with no problem. You must have a 1 ton.

    Yeah, either way would work, I'd probably leave it in the "unloaded" position, so I wasn't wearing the rear brakes too much..fronts do most of the work anyway. It's to vary the braking ability of the rear based on vehicle load.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    cool thanks for the info. i guess i'll take the arm off.

    donate to the "Build Scott's Suburban Foundation"
    scott,
    1989 GMC suburban 3/4t 4" lift soon to be rollin on 36" swampers, tbi350, th350, np241
     
  8. Thumper

    Thumper 1/2 ton status

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    What prop valve is that? I have been having trouble with my rear discs and if there is another stinkin valve in the system I have to look at it. Where is it located? I havent seen anything like what you described under mine.

    Mike


    <font color=blue>Thumper
    85 Fullsize Jimmy
    [​IMG]
    <font color=red>Aint Skeered!! </font color=red>
     
  9. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    that's because i have a 3/4 ton. i don't think K5s have 'em. my friend's doesn't. but it's right above the pinion for the rear diff.

    donate to the "Build Scott's Suburban Foundation"
    scott,
    1989 GMC suburban 3/4t 4" lift soon to be rollin on 36" swampers, tbi350, th350, np241
     
  10. pr1aw

    pr1aw 1/2 ton status

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    Left mine off when I lifted my Toy 5 inches, I didn't notice any difference. Its there for when you load down the back end and gives the back brakes stopping power.
     
  11. Thumper

    Thumper 1/2 ton status

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    gotcha... [​IMG]
    Me a 1/2 ton guy for a while yet!

    Mike


    <font color=blue>Thumper
    85 Fullsize Jimmy
    [​IMG]
    <font color=red>Aint Skeered!! </font color=red>
     

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