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Front brakes lock up when road wet

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by backlash, Nov 25, 2001.

  1. backlash

    backlash 1/2 ton status

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    This is an old story, but ...

    My front brakes are too sensative ... sometimes. Occasionally, they will both lock up (1 %), but the main issue is that the front will alternate locking up only about 5 % of the time. May have a difference with the wheel turned, but not possitive. The rear do not lock up at all. AND this lock up occurs with very little pedal pressure.

    Any ideas?
     
  2. sosamantx

    sosamantx 1/2 ton status

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    hmmm, not to sure, but I'd check it out. maybe a sticking caliper?? i'd pull the pads and see if anything is on them (i've seen a rock get wedged in there before)?? and check out the rotors themselves?? what about the wheel bearings?? are they snug?? (may cause a little play/wobble??) sorry, not much help!

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    <a target="_blank" href=http://sosaman.home.texas.net/carpics.html>http://sosaman.home.texas.net/carpics.html</a>
     
  3. DesertDueler

    DesertDueler 1/2 ton status

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    Adjust your rear brakes and that will help alot.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  4. backlash

    backlash 1/2 ton status

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    Actually, I just replaced the wheel cylinders and adjusted them. It made no difference. Any other ideas?

    I'm beginning to think the NEW proportioning valve may have some trash in it. Would that cause the variation in one side to the other?
     
  5. sosamantx

    sosamantx 1/2 ton status

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    was it doing this prior to replacing the valve?? If not, i'd rebleed the system again, and go from there. If so, I'd do what's posted above, and what about brake line hose(s) for the front??

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    <a target="_blank" href=http://sosaman.home.texas.net/carpics.html>http://sosaman.home.texas.net/carpics.html</a>
     
  6. taterblazer

    taterblazer 1/2 ton status

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    Mine was locking up on the front left. Replacing the calipers and shoes fixed it. I'd start with bleeding them though.
     
  7. backlash

    backlash 1/2 ton status

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    Actually, it's not on just one side. Seems to be related to the weight of the vehicle on a turn. On a left turn, the left will lock up (rarely), and when on a right hand the right will lock up. Again this is only rarely. Not sure what a proportining valve does. Seems like it should keep even pressure to both sides. And doesn't it work from front to back as well. Would that account for the feel that the front lock up and the rear do not?

    Just trying to figure this out.
     

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