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Bleed nipple on a brake caliper

Discussion in 'Z3 Roadster & Coupé' started by Philpatton, Sep 10, 2019.

  1. Philpatton

    Philpatton Dedicated Member

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    Evening all,
    I’m just finishing up the refurb of 2 rear Bmw brake callipers I got of a fellow forum member and I want to make sure I don’t snap the bleed nipple when I come to install the callipers. I’ve been spraying a little wd40 onto the caliper where the nipple is to allow it to penetrate the threads since Sunday and I’ve been tapping the area with a hammer to try and break any corrosion that may be binding up the nipple.
    I there anything else I can do to make sure that when I finally try and open the nipple, it doesn’t shear?
     
  2. Althulas

    Althulas Zorg Guru (III)
    British Zeds

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    Could try a bit of heat around the bleed nipple area and then spray some more wd40 but if they are well rotted in may need to resort to drilling them out. Mine were well and truly stuck managed to unloosen the rears but my front bleed nipples just crumbled. Best of luck.
     
  3. mrscalex

    mrscalex Zorg Guru (IV)
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    I've found they round off before they snap.

    I just have a replacement caliper on standby now. Too much hassle drilling out.
     
  4. t-tony

    t-tony Zorg Expert (I)
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    Use a 1/4" drive 6 point socket not a spanner. Try to tightening direction before loosening.

    Tony.
     
    #4 t-tony, Sep 11, 2019
    Last edited: Sep 11, 2019
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  5. Sean d

    Sean d Zorg Guru (V)
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    Cracking off of the bleed nipple is the first thing I do when refurbing calipers because if one snaps the caliper is only good for the scrap bin, just done these. I like using freeze spray as it contracts the steel nipple and can help break a bond. 20190830_120001.jpg
     
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  6. Philpatton

    Philpatton Dedicated Member

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    Well, after days of spraying with wd-40, I got home today, took my ring spanner’s and took the nipples out. They were very tight, but came out anyway. I ended up using another spanner to lever on the 7mm spanner to get enough force on it.
    I tried my 7mm socket, but is wasn’t deep enough and only captured 1/2 of the nut.
    Next job is paint, but they will not be anything as smart as Seans. They look proper smart!
    P
     
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  7. motco

    motco Zorg Addict

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    I have to change my brake fluid - you make my blood run cold with the possible snags! I have bled brakes through the pipe union before now because I was worried about the nipple failing.