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  • FIRST POST
    • stranger12
    • By stranger12 11th Jun 17, 10:47 PM
    • 501Posts
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    stranger12
    Caliper nipple
    • #1
    • 11th Jun 17, 10:47 PM
    Caliper nipple 11th Jun 17 at 10:47 PM
    Hi all

    I changed my caliper to evo 9 and 350 disc in dec

    One of the calipers was leaking from piston so took it off and rebuilt it today

    Car was off road for 6 month plus and caliper was in a box

    When i was rebuilding today, i opened the two bleed nipples and noticed the thread coming off with it

    Did some googling and think it is to do with galvanised rust( sorry if that is not the right term)


    Bottom line is, it is leaking and can't put the nipples back

    It is an m10 x 1.0 so bought both helicoil and tap and die for it

    I want to try and tap it first and if that fails then drill next size up and helicoil

    Question i have is, if existing thread is gone, is there any chance the tap works?

    I guess if there is no metal then it can't tap or re create the thread

    I then thought of taking it to someone to weld it and drill it again but not sure if they will up the bleed hole or not

    What would you do ?


    I am so angry and annoyed and think the issue happened due to no brake fluid been there so the bolt freezed
    Last edited by MSE ForumTeam5; 12-06-2017 at 11:26 AM.
Page 1
    • rich13348
    • By rich13348 11th Jun 17, 11:11 PM
    • 768 Posts
    • 405 Thanks
    rich13348
    • #2
    • 11th Jun 17, 11:11 PM
    • #2
    • 11th Jun 17, 11:11 PM
    I think the typo is evidence of your issue. Hope stripped for the caliper. As you have guessed you cannot tap what isn't there and going to a bigger size would require redrilling and they you would need to get the right sized bleed nipple to fix.

    Can you trade in your caliper for a professional rebuilt one?
    • stranger12
    • By stranger12 11th Jun 17, 11:13 PM
    • 501 Posts
    • 16 Thanks
    stranger12
    • #3
    • 11th Jun 17, 11:13 PM
    • #3
    • 11th Jun 17, 11:13 PM
    Is there a machinery service or professional people who can weld the hole and re drill it?

    I am refering to fabricators
    • Strider590
    • By Strider590 12th Jun 17, 12:25 AM
    • 11,167 Posts
    • 6,207 Thanks
    Strider590
    • #4
    • 12th Jun 17, 12:25 AM
    • #4
    • 12th Jun 17, 12:25 AM
    If drilled and helicoiled or rethreaded, the new thread would have to be extremely accurately square with the tapered seal inside the hole, or itll never seal, plus any swarf left behind would stop the seal working and/or find its way to the piston.
    Having the last word isn't the same as being right.......

    "Never confuse education with intelligence"
    • Retrogamer
    • By Retrogamer 12th Jun 17, 1:25 AM
    • 3,695 Posts
    • 3,685 Thanks
    Retrogamer
    • #5
    • 12th Jun 17, 1:25 AM
    • #5
    • 12th Jun 17, 1:25 AM
    I had the same problem as you.
    The issue occurs usually on rear calipers as they're made from alloy and the bleed nipples are steel so the two metals combined creates galvanic corrosion.

    I replaced the caliper as anything else wasn't worth the headache.
    • AdrianC
    • By AdrianC 12th Jun 17, 8:22 AM
    • 14,359 Posts
    • 12,699 Thanks
    AdrianC
    • #6
    • 12th Jun 17, 8:22 AM
    • #6
    • 12th Jun 17, 8:22 AM
    I want to try and tap it first and if that fails then drill next size up and helicoil
    Originally posted by stranger12
    This is the right way forward.

    Question i have is, if existing thread is gone, is there any chance the tap works?
    That's when you would drill and retap to M12.

    I ... think the issue happened due to no brake fluid been there so the bolt freezed
    Nope. The thread shouldn't be in contact with fluid anyway, so it'd make no difference. The seal is made by the tip of the nip in contact with the seat, below the thread.

    Were these calipers new, reconditioned, used?
    • stranger12
    • By stranger12 12th Jun 17, 8:30 AM
    • 501 Posts
    • 16 Thanks
    stranger12
    • #7
    • 12th Jun 17, 8:30 AM
    • #7
    • 12th Jun 17, 8:30 AM
    It was used caliper

    Question is , do fabricators weld and redrill?

    I don't want to heli coil it

    Also if you helicoil then the nipple may not sit in the right place and hence no seal
    • AdrianC
    • By AdrianC 12th Jun 17, 8:31 AM
    • 14,359 Posts
    • 12,699 Thanks
    AdrianC
    • #8
    • 12th Jun 17, 8:31 AM
    • #8
    • 12th Jun 17, 8:31 AM
    It was used caliper

    Question is , do fabricators weld and redrill?

    I don't want to heli coil it

    Also if you helicoil then the nipple may not sit in the right place and hence no seal
    Originally posted by stranger12
    Then just buy a recon. You may find that they won't give you the exchange credit for this one, though.
    • stranger12
    • By stranger12 12th Jun 17, 8:34 AM
    • 501 Posts
    • 16 Thanks
    stranger12
    • #9
    • 12th Jun 17, 8:34 AM
    • #9
    • 12th Jun 17, 8:34 AM
    Seems like only option if i can't get a fabricator to weld and drill

    They aren't cheap at £300 a caliper ( second hand) or £1000 brand new

    It is for 350mm disc brembo!
    • AdrianC
    • By AdrianC 12th Jun 17, 8:45 AM
    • 14,359 Posts
    • 12,699 Thanks
    AdrianC
    Seems like only option if i can't get a fabricator to weld and drill

    They aren't cheap at £300 a caliper ( second hand) or £1000 brand new

    It is for 350mm disc brembo!
    Originally posted by stranger12
    Perhaps you should have thought of that before embarking on this modification route? You've spent strong money on a pair of used calipers which turn out to be fairly shagged, and now you're complaining that it'll be even stronger money to get usable ones.

    I very much doubt it'll cost £700 to get one caliper rebuilt, though. Talk to somebody like BigRedd.
    • stranger12
    • By stranger12 12th Jun 17, 8:52 AM
    • 501 Posts
    • 16 Thanks
    stranger12
    When people say rebuild, they are normally refering to seal kit

    That is done but my issue is bleeder nipple
    • AdrianC
    • By AdrianC 12th Jun 17, 8:54 AM
    • 14,359 Posts
    • 12,699 Thanks
    AdrianC
    When people say rebuild, they are normally refering to seal kit

    That is done but my issue is bleeder nipple
    Originally posted by stranger12
    A proper rebuild will look at everything.
    • BeenThroughItAll
    • By BeenThroughItAll 12th Jun 17, 10:48 AM
    • 4,150 Posts
    • 3,488 Thanks
    BeenThroughItAll
    Posted this on the other thread before I realised it was a duplicate, so much of this has been said already.


    It's 'galvanic corrosion'.



    You may get away with retapping, but you'll need to be very careful not to damage the bleed nipple hole tapered seat, so you'll need a flat-ended plug tap not a taper tap.


    If that doesn't work, again you'd need to be very careful if drilling and helicoiling not to damage the seat.


    If it were me, I'd buy a new caliper. Fixing the old one is way too difficult to do properly without a machine shop.
    • stranger12
    • By stranger12 12th Jun 17, 11:00 AM
    • 501 Posts
    • 16 Thanks
    stranger12
    Question i have is how can i find a machining shop?

    I am happy to pay a shop if there is a machining shop and it will be cheaper than £300
    • AdrianC
    • By AdrianC 12th Jun 17, 11:04 AM
    • 14,359 Posts
    • 12,699 Thanks
    AdrianC
    Have you actually investigated the cost of having them properly reconditioned?

    BiggRed don't give a price on their site, but BCS do -
    http://www.brakecaliperspecialists.uk/brake-caliper-refurbishment/brembo/
    £130 for a pair of four-pot Brembo calipers.
    • tedted
    • By tedted 12th Jun 17, 1:15 PM
    • 122 Posts
    • 41 Thanks
    tedted
    ( Potential additional charges include engineering work including bolt extractions, re-threads, helicoils, making inserts to name a few.)
    bit further down on there bwebsite
    • AdrianC
    • By AdrianC 12th Jun 17, 1:16 PM
    • 14,359 Posts
    • 12,699 Thanks
    AdrianC
    Sure, but still a big chunk less than £300 each.
    • molerat
    • By molerat 12th Jun 17, 2:31 PM
    • 16,457 Posts
    • 10,629 Thanks
    molerat
    Sure, but still a big chunk less than £300 each.
    Originally posted by AdrianC
    Indeed. Plus the caliper will be "as new". Giving it to a random engineering workshop, although they will re-do the damaged thread properly, will probably still result in the caliper needing an overhaul as the seals etc will likely be damaged in the process.
    www.helpforheroes.org.uk/donations.html
    • Jackmydad
    • By Jackmydad 12th Jun 17, 3:00 PM
    • 180 Posts
    • 97 Thanks
    Jackmydad
    Indeed. Plus the caliper will be "as new". Giving it to a random engineering workshop, although they will re-do the damaged thread properly, will probably still result in the caliper needing an overhaul as the seals etc will likely be damaged in the process.
    Originally posted by molerat
    I wouldn't do it myself without pulling the caliper apart to be able to clean it out properly.
    A specialist firm has to be the way to go. They're going to have the right kit to do the job properly. I imagine you have to jig the caliper up on a drill press or similar to make sure the thread is cut square to the seat.
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