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Hydroboost leaking

Discussion in 'Tech Discussion' started by lothar863, Feb 11, 2019.

  1. lothar863

    lothar863 Full Access Member

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    Joined:
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    Location:
    Nashville TN
    First Name:
    Colton
    Truck Year:
    1989
    Truck Model:
    r3500
    Engine Size:
    7.4 FI
    I have found that my hydroboost unit is leaking from a rear seal and dripping into the cab.

    I looked under the floor mat and I think this has been going on for awhile looking at the carpet.

    Is this unit rebuild-able? It is working there is just a small drip of fluid every time I press the brake.
     
  2. Big Chip

    Big Chip Full Access Member

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    Location:
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    First Name:
    Kevin
    Truck Year:
    1979
    Truck Model:
    C35
    Engine Size:
    454
    I had that exact same thing happening. I don’t know if they are “self-rebuildable” but rebuilding is available or rebuilt units are also available. You need your brake code to get the proper one. O’Reilly is where I found mine after a fruitless internet search. I don’t recall cost.
     
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  3. lothar863

    lothar863 Full Access Member

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    First Name:
    Colton
    Truck Year:
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    Truck Model:
    r3500
    Engine Size:
    7.4 FI
    Where do i find my brake code?
     
  4. Rickf

    Rickf Full Access Member

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  5. Blue Ox

    Blue Ox Turning Diesel Fuel Into Fun

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    First Name:
    Derek
    Truck Year:
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    Truck Model:
    K20HD
    Engine Size:
    6.2L
    Whatever you do, make sure you use power steering fluid in the replacement, not Dexron. Ignore the manual. ATF will make them leak. Ask me how I know.
     
  6. 82Diesel

    82Diesel Full Access Member

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    KH
    Truck Year:
    1982
    Truck Model:
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    Engine Size:
    6.2L
    Dang. I kinda got the same Superstition on my 82 C20 with the 6.2 in it... I check it once n a while, although it's a parts truck engine/trans etc still complete. But Yeah I'm hoping this one isn't bad either... I think it's just a break line blew. I don't care about it anyhow the rear drum is stuck and I already tried to unstick it but gave up... lol It's a 3/4 Ton so.
     
  7. Blue Ox

    Blue Ox Turning Diesel Fuel Into Fun

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    Engine Size:
    6.2L
    Hydroboost will leak into the cab when it fails. if it's leaking outside it's something else.
     
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  8. 82Diesel

    82Diesel Full Access Member

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    6.2L
    Gotcha. Probably a brake line then... when i bought that 3/4 Ton truck it sat for 23 yrs. (93) when the owner parked it, He was easily 85 yrs old.
     

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