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Rear end questions

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by **DONOTDELETE**, Nov 22, 2001.

    I just installed a junkyard rear end and am having a couple of "gremlins" I'm trying to find. First, I took the brakes off of the rear end that I broke and installed them on the new one. I replaced one wheel cylinder, but now I can't get the rear brakes bled. Do I need to replace the other wheel cylinder? Also, my brake light won't go off. Second, I start getting vibration at around 40 mph. Should I use the yoke off my old rear end, or is there something else I need to do?

    American by birth, Marine by the grace of God
     
  1. 95 Silverado

    95 Silverado 1/2 ton status

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    if the other wheel cylinder is good you won't have to replace it, but you will have to bleed both sides, you may have air trapped in the line running to the rear along the frame. you may have to reset your proportioning valve to put out the brake light, but it may go out itself when you correct the brake problem. Is the yoke on the old rear end the same as the new one, it should have notches in it to center the u-joint in the yoke, if the yoke is wider and the u-joint isn't centered you will have to change yokes or get a different u-joint that fits that yoke.
     
  2. 90K5

    90K5 1/2 ton status

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    When I did my axle swap, I got a lot of air in the brake lines too, and couldn't get it out myself. Ended up getting it power bled for about $30, which did the trick.

    90K5
     
  3. MudFrog

    MudFrog 1/2 ton status

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    Thats the same thing that happened to me.

    89 K5 Silverado, 4", 33's, 3/4 ton axles
    <a target="_blank" href=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</a>
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Sounds like the proportion/combination valve isn't centered right.
    I've had good luck letting the rear brakes gravity bleed and it seems to center the prop/combo valve. If don't see to have any air in the rear try gravity bleeding the fronts a bit and see if the comb/prop valve doesn't center itself. Then just bleed out all four brakes. Otherwise you'll need to get the pin pushed on the combo/prop valve while you bleed. Kinda a PIA.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     

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