98 K2500 Hydroboost to NBS/GMT800 Hydroboost

Discussion in 'Axles + Brakes' started by CTX-SLPR, Mar 2, 2021.

  1. CTX-SLPR

    CTX-SLPR OBS Enthusiast

    Messages:
    53
    Likes Received:
    22
    Joined:
    Oct 13, 2016
    Location:
    Livermore, CA
    The hydroboost is leaking on my 98 K2500 Suburban, it's wet back where the cast iron front and rear halfs meet up. I've done some searching but most of what I see is for 1500 Vac to hydroboost. I would love to make my brakes work a bit better on my Suburban with the GMT800 Master as well which I believe requires the GMT800 hydroboost. It seems easy enough to go hydroboost to hydroboost other than swapping the mounting plate from the GMT400 hydroboost over.

    Big question I didn't see an answer to was the pedal pushrod? I have pulled a pushrod out of a hydroboost before so I could do that but it does leave the crimped socket a bit mangled. Seeing as the core value is pretty minimal on the GMT400 unit can I cut and splice them like was done to extend the GMT800 in this thread (https://www.gmt400.com/threads/gmt400-vac-to-gmt800-suburban-hydroboost-conversion-detailed-write-up.27168/) ?

    Thanks
     
    Last edited: Mar 3, 2021
  2. rojas84

    rojas84 I'm Awesome

    Messages:
    140
    Likes Received:
    118
    Joined:
    Feb 2, 2010
    I have one ready to go into my c2500 that I swapped the pushrod and the mounting plate I removed from an 04 yukon XL haven't got around to installing yet but will get it done as soon as the snow melts .. I did put a tac weld on the 800 hb when I put the 400 pushrod in

    Sent from my SM-G955U using Tapatalk
     
  3. CTX-SLPR

    CTX-SLPR OBS Enthusiast

    Messages:
    53
    Likes Received:
    22
    Joined:
    Oct 13, 2016
    Location:
    Livermore, CA
    Looking forward to seeing how it works out for you.
     
    rojas84 likes this.
  4. yevgenievich

    yevgenievich OBS Enthusiast

    Messages:
    51
    Likes Received:
    60
    Joined:
    Jan 21, 2021
    Location:
    TX
    Interested in the same swap. Will try to see if gmt800 with hydroboost comes by the local yard.
     

Share This Page