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Help brake caliper bleed valve is damage :(

Discussion in 'A4/S4 forum(B5 Chassis)' started by Nez, Sep 5, 2010.

  1. Nez
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    Nez Member

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    [Sep 5, 2010]
    Hi guys after I fitted my new pads I tried to bleed the breaks and by mistake I damaged the bleeding valve and now its leaking and its damaged from inside the caliper [​IMG] how can I fix this :( the valve its self is not damaged its the housing of it that is damage :(
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  3. jcb
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    jcb Active Member VCDS Map User

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    [Sep 5, 2010]
    how did you damage it? normally you can only shear the nipple off.
    if the caliper itself is damamged I am not sure you can do anything other than swap it for one that is not damaged
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  4. Nez
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    Nez Member

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    [Sep 5, 2010]
    I was trying to luck the valve and I over luck it and inside the housing valve get damaged.
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  5. evilscotsman
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    evilscotsman Space Cowboy

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    [Sep 5, 2010]
    if you have stripped the threads in the bleed nipple socket, the caliper will need replaced.
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  6. jcb
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    jcb Active Member VCDS Map User

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    [Sep 6, 2010]
    the caliper is cast steel, the nipple is alloy, you could cross thread that thing all day long and all you will do is strip the thread ON THE NIPPLE.
    can you post a pic as I am still not sure what you have done.

    if the nipple thread came off you may just have swarf or bits left in the hole which could look worse than it is. you can chase that out with a tap (cheap tap and die set will cost you £20-30 from machine mart or similar)
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  7. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Sep 6, 2010]
    Alloy nipples? dont think so! The nipple and other hydraulic fittings are all steel.

    They're RS4 calipers too, which i'm pretty sure will be alloy, so you've most likely stripped the thread out the caliper.

    It will need bored out to a larger size, retapped and the sealing seat might need recut too.
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  8. Nez
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    Nez Member

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    [Sep 6, 2010]
    I have damaged the thread only and the nipple is not damage, I will try to take picture of it.
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  9. Nez
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    Nez Member

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    [Sep 6, 2010]
    Here is the picture of the caliper:

    [​IMG]

    [​IMG]
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  10. evilscotsman
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    evilscotsman Space Cowboy

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    [Sep 6, 2010]
    just suction out the swarf with a vacuum cleaner and screw a new nipple in, see if it seals. The nipple will be steel but as long as a new one screws down a few bad threads isnt the end of the world, it doesnt look chewed up in there yet.
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  11. Nez
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    Nez Member

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    [Sep 6, 2010]
    I don't know I am thinking to retap the thread and then put a new nipple.
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  12. evilscotsman
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    evilscotsman Space Cowboy

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    [Sep 6, 2010]
    as long as you get all the swarf out, especially even tiny particles. Stick a neo magnet on the tap so it collects the cuttings and particles as it turns - so just run the same size tap thru, the point on the nipple is what seals the hole, using force developed from the threads, the threads are not really a seal themselves but enable the nipple's tapered point to plug the hole in the bottom and stay there. They just need cleaned out with a plug tap (dont use a taper tap, it will bottom out before it gets halfway down the hole)
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  13. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Sep 6, 2010]
    hes already stripped the threads....
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  14. Nez
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    Nez Member

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    [Sep 8, 2010]
    Yea thats true :(
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  15. murran
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    murran Active Member

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    [Sep 8, 2010]
    s/h caliper will be the best bet. steel nipple in an ally caliper will always cause problems, never used to be like it on old audis..... but still versprung dik technik... or whatever the marketing department say.......
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  16. Nez
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    Nez Member

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    [Sep 9, 2010]
    Good News caliper has been fixed :) after putting new valve everything is back to normal :) and there is no leaking.
    Thanks for all the helps guys :)
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  17. evilscotsman
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    evilscotsman Space Cowboy

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    [Sep 9, 2010]
    np nez :)
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