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Thread: Brake Expansion Tank (fluid resviour) leaking

  1. #1
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    Default Brake Expansion Tank (fluid resviour) leaking

    The rear plug is all wet with fluid, and it's dripping down onto the brake booster. The front one seems better.

    Part number 2: 34311160133 - The plugs
    http://realoem.com/bmw/showparts.do?...=34&fg=25&hl=7

    Anyone done this before and is there anything I should take note of when removing and installing it again?

    Any more advice on changing the plugs?
    Last edited by BigKriss; 04-23-2007 at 05:27 AM.

  2. #2
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    pull the tank off pop the #2s out and pop in the new ones, smear a little fluid on them before pushing the tank back in, use the bmw spec fluid, not sure if you have the same standards down there, dot 4 is the recomended fluid here, dot 3 is the most common avalable and it usually eats those grommits, i am figuring it's the alcohol that does it. they generally don't need bleeding
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  3. #3
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    Wow, thanks for the quick reply Winfred. I'm using Lucas Grand Prix 600 brake fluid. I'm assuming it's okay for the e34.

  4. #4
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    Quote Originally Posted by BigKriss
    Wow, thanks for the quick reply Winfred. I'm using Lucas Grand Prix 600 brake fluid. I'm assuming it's okay for the e34.
    You need Super Dot 4 spec fluid, Kris... Castrol do it. There's aguy that sells it cheap in bulk on ebay.com.au

    Join the Aussie
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    08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!

  5. #5
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    LUCAS brake fluid? Ha, ha ha As in the inventor of intermittant wipers? lights etc.
    Frightening concept.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  6. #6
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    I think I used that last time, but the lucas stuff has slightly higher boiling points. The Castrol stuff is a lot cheaper though.


    Quote Originally Posted by genphreak
    You need Super Dot 4 spec fluid, Kris... Castrol do it. There's aguy that sells it cheap in bulk on ebay.com.au

  7. #7
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    castroil gt-lma is dot 4 and good stuff, pretty much if it's good for a old british car it should be ok from a eating the rubber stand point, the natural rubber gets turned to jello by the crap dot 3 fluid
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  8. #8
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    backward compatible with Dot 5.1 and 4
    Quote Originally Posted by genphreak
    You need Super Dot 4 spec fluid, Kris... Castrol do it. There's aguy that sells it cheap in bulk on ebay.com.au
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

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