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Hydroboost conversion and ABS problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Eric M., Sep 28, 2003.

  1. Eric M.

    Eric M. 1/2 ton status

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    I converted my 91 V2500 Suburban to Hydroboost brakes. I swapped in a 91 V3500 pump with 2 return lines and a 91 V3500 Hydroboost unit and master cylinder. The truck stops fine, but the rear ABS isn't working the way it should. On hard stops, they let the rears lock up. I'm assuming the Hydroboost and larger master are creating more pressure than the ABS unit was designed to handle. This is the old style ABS with the isolation / dump valve and an ABS ECU, no sensors at the wheels. I already have the 14 Bolt FF rear with the large 1 ton brakes and a Dana 60 front with 1 ton brakes. I'm thinking I need to ask a dealer if the ABS ECU or isolation / dump valve or even the combination valve are different between the 91 V2500 Burb and a 91 V3500 1 ton truck, and if so, start swapping them one at a time.

    Anyone have any experience with hydroboost / ABS swaps before I hand my credit card over to the GM parts guy.

    Thanks,

    Eric M.
     
  2. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Eric, Check out this site-JIML'S brake paper.has a lot of info on hydroboost.....hope this helps
     
  3. Confedneck

    Confedneck 3/4 ton status

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    what site is that? /forums/images/graemlins/confused.gif
     
  4. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    [ QUOTE ]
    what site is that? /forums/images/graemlins/confused.gif

    [/ QUOTE ]just a site with a ton of info on brakes.................
     
  5. Eric M.

    Eric M. 1/2 ton status

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    Mudjunkie - Thanks,

    I did check out that site. They discussed Hydroboost, but not concerning a swap with ABS. Someone needs to tell the guys over there you don't have to buy all your Hydroboost parts from the dealer! You should see the numbers they were quoting for conversions /forums/images/graemlins/blush.gif


    Got any pics. of that 82 with the 540 and a 12-71 blower?


    Eric M.
     
  6. Eric M.

    Eric M. 1/2 ton status

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  7. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    have a couple but not sure how to post them?
     
  8. Eric M.

    Eric M. 1/2 ton status

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    MudJunkie,

    e-mail the pics. to me, I'll get them up somewhere.

    Eric M.

    eric@mannon.com
     
  9. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Eric, Forgot to mention talk to randy (r72k5 ) he knows alot about this and might be able to help..............
     

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