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Brakes have me puzzled...

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

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well I'm just kinda boggled here w/ my brakes since the lift... I know they wouldn't stop as good, but I have a low pedal that definetly won't stop the truck on a dime in an emergency, but it stops ok normally. I actually hit them hard once since the lift and the rears locked up, but the frt's didn't seem to kick in...or at least not enough. I have bled these babies a ton of different ways and there is absolutly no air in there. No leaks and I never have to add fluid... wheel cylinders are new... calipers seem ok... I threw in a master just for the heck of it figuring it may be leaking internally.... still the pedal is low. So what I'm wondering is if anyone else had this problem after a lift or w/ the Pro Comp steel brakes lines. I'm not sure if the proportion valve is messed or what. I have never replaced one before in my days as a tech... and I have shot the senerio around to numerous old techs... or the old wise men and they are kinda puzzled like I am. I hate to rip out the proportion valve because it now has the ORD brace in front of it, if I'm not sure it is it. I don't think it should matter that I went from 2 10B's to a D44/12B setup... plates and calipers are off the 10B though. Anyone have any thoughts?

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <A target="_blank" HREF=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</A>
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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    Lots of us have had that same problem.............and the answer was (for me among others, including Steve) POWERBLEEDING..............spend the $60 and have a shop (4 wheel drive or dealership) powerbleed them.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.alloffroad.com>http://www.blazzinor.alloffroad.com</A>
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Every time my brakes get low I find it's the rears are out of adjustment. Manualy adjust them up till they have a slight drag and all is fine again on my trucks. There is also a button on the proportioning valve that needs to be pressed when bleeding them one end has a rubber cap and the button is under the cap. Cap does not need to be removed to press.

    It's not my damn planet monkey boy!
    Grim-Reaper
     
  4. Twiz

    Twiz 1/2 ton status

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    Totaly agree with what Grimy said.

    Keep in mind, the higher center of gravity and the larger tires. You will lock up the rears, no-prob, but unable to lock up the fronts (unless you realy try hard)

    Twizy
     
  5. DMK

    DMK 1/2 ton status

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    Yeah check adjusters. They could be froze up too. Replacements I got were 10 bucks each.
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    Yeah our head tech has a power bleeder that I'm gonna borrow. I was checking out what they had on All Data on the proportioning valve and it mention something about a tool (but would guess I could do it w/ some pliers maybe) to hold open something on the valve.... is that what you are refering to Grim? The rears are alll adjusted good.... probably the reason it stops as good as it does and the adjusters and that are all new BTW. I will give it a shot and see what I can accomplish.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <A target="_blank" HREF=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</A>
     
  7. Triaged

    Triaged 1/2 ton status

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    I have seen the clip before but never seen where you could buy one. I have heard of people using a wooden dowel cut to length and wedged up against something to hold the button in. There is also a bleeder on the Prop. valve.

    '71 Blazer CST with alot of rust
     

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