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Thread: Hydraulic brake servo unit

  1. #1
    Join Date
    Feb 2019
    Location
    Fredericksburg,VA
    Posts
    11
    My Cars
    1979 BMW 733i

    Hydraulic brake servo unit

    Ok, so I have far too much ATF leaking from the union of the brake servo unit where it mates with the brake master cylinder. Has anyone take one of these apart and can enlighten me on what is inside and how to get into it? The master cylinder is not leaking at all.

    This servo is item #1 in this... https://www.realoem.com/bmw/images/diag_3gf.png

    The master is unnumbered in this: https://www.realoem.com/bmw/images/diag_3eo.png

    These are from these pages respectively... servo: https://www.realoem.com/bmw/enUS/sho...diagId=34_0267
    and master: https://www.realoem.com/bmw/enUS/sho...diagId=34_0122

    This is on my 1979 733i. I would assume there are some O-rings and sliding spindles of some sort.
    Thanks,
    Scott
    1979 733i

  2. #2
    Join Date
    Mar 2007
    Location
    Quadratechtown, PA
    Posts
    648
    My Cars
    5, 7, 4x4

  3. #3
    Join Date
    Feb 2019
    Location
    Fredericksburg,VA
    Posts
    11
    My Cars
    1979 BMW 733i
    Spectacular! Perfect thanks a bunch.
    Scott
    1979 733i

  4. #4
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,228
    My Cars
    1983/84/85 745i

    Thumbs up

    I second Jay. He does great work for the community.

    FWIW, if you are in there that far you should replace all the low pressure hydroboost lines at minimum, too. Due to age of our vehicles, consider rebuilding the high side hoses.
    I sell Motronic 013 ECU boost cut delete chips and drop in Tial conversions.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i (will be for sale!)
    IH, Ford, MB, Volvo, and GM round out the pack.



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