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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1645
Location: east mids


PostPosted: Fri Oct 06, 2017 4:22 pm    Post subject: Molegrips on nipples Reply with quote

OK out of the 4 bleed nipples on my front calipers I've managed to undo one.... the rest are heavily corroded..
Flare spanner is just slipping.. I'm thinking of trying mole grips then replacing the nipples with stainless ones... is this a good idea or am I likely to snap them Question
I'm hitting then with the shock and unlock freeze spay stuff for now..
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cliffbase
Silverstone


Joined: 03 Apr 2017
Posts: 117



PostPosted: Fri Oct 06, 2017 4:49 pm    Post subject: Reply with quote

Sorry, clicked on this expecting something entirely different!

Personally id advise against molegrips, try penetrating fluid overnight, and if you can get it on a 6 sided ring spanner.

Surprised
 
  
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Endex
Monza


Joined: 10 Jan 2016
Posts: 178
Location: Preston, Lancashire


PostPosted: Fri Oct 06, 2017 5:52 pm    Post subject: Reply with quote

cliffbase wrote:
Sorry, clicked on this expecting something entirely different!

Personally id advise against molegrips, try penetrating fluid overnight, and if you can get it on a 6 sided ring spanner.

Surprised


Me too! Though I was going to recommend a small 'speciality' club in Leeds if you're into that kind of thing!

Back to your real question - I'd try to avoid mole grips too, penetrating fluid and a good fitting spanner as already suggested. Surprised
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mikeluke
Hockenheim


Joined: 03 Jun 2014
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Location: Hampshire


PostPosted: Fri Oct 06, 2017 5:52 pm    Post subject: Reply with quote

And maybe a gentle bit of heat...
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Demort
Estoril


Joined: 21 Mar 2015
Posts: 3501
Location: Sussex


PostPosted: Fri Oct 06, 2017 6:03 pm    Post subject: Reply with quote

Try just bleeding the side from the brake pipe replacement .. if no good then this may be a problem ..

DONT use mole grips .. you need a socket and knock it onto the bleed nipples ( large hammer .. well not that large ) .

Ive not come across ones so bad a socket wouldn,t fit .. But .. there is a very good chance they will snap .. you dont have a lot of choice though if you have to bleed them .

Crack them a bit and see if it starts to undo , then if loose carry on .. if not try doing up and undoing to try and slowly work them out.

If they snap .. im sorry here as i think at least one will then there are companys that can replace the bleed nipples , your local indy may even do this .. i know we do .

If you can get 1undone from each side then try to bleed just them with out attempting to remove the other 2 .. you may get away with it .
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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1645
Location: east mids


PostPosted: Fri Oct 06, 2017 7:08 pm    Post subject: Reply with quote

Thanks gents Thumb
Demort... The one I got undone was on the
Caliper that the line broke so that's a bit of a bonus... But of course I had the caliper on the other side off too because I replaced the rubber hoses with braided ones sadly on that side the 11mm socket is slipping already so I'm guessing a 10mm and a hammer should work....

To be honest I used this method to get the nut off the caliper where the hard line snapped...

The back calipers and hoses I've not touched yet
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kas750
Paul Ricard


Joined: 31 Mar 2013
Posts: 3401
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Fri Oct 06, 2017 8:16 pm    Post subject: Reply with quote

Weld a hexagon nut through it's centre over the nipple top and then simply wind it out.
This works like a charm on the most stubborn of nipples.
The heat cycle delivered to the core of the thread breaks the seizure. thumbsup
 
  
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Demort
Estoril


Joined: 21 Mar 2015
Posts: 3501
Location: Sussex


PostPosted: Fri Oct 06, 2017 8:31 pm    Post subject: Reply with quote

kas750 is totally correct , that is a very good method .. but you need to own a welder .

Its not a method i can advise though as heat and brake fluid dont go well , and i have to be a little carefull what i say im afraid .

If not then you are kinda stuck with hammering on a smaller socket .

Ive snapped more than my fair share over the years im afraid and most are without trying .. made of chocolate they are , makes a quick job turn into a pain .

Only positive is you can get the broken one removed but it does normally mean sending the caliper away to a specialist if there is no one local .
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
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Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Oct 06, 2017 9:08 pm    Post subject: Reply with quote

All this talk of nipples, wrenching, bleeding, etc. reminds of some friends of mine back in the 80s. Remember when you used to do daft stuff with mates like 'Chinese rings' and 'nipple wrenches'. I'll never forget one of my mates giving another lad a nipple wrench in metal work.......but instead of the usual thumb and fore finger method, he thought it might be more exciting using a pair of tin snips. Looked rather funny until all the red started appearing through his shirt.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7170
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Fri Oct 06, 2017 9:46 pm    Post subject: Reply with quote

I have snapped a couple in my time and I wish I had welded a nut onto them rather than trying harder to get them out, they always snap, then it's a nightmare to get them out due to the taper at the end, if you drill out incorrectly and take some of the taper the bleed nipple will never seal again and the caliper is scrap. I also had an "easy out" snap in one which opened up a whole new world of pain.

The combination of corrosion, small threaded bolt and being hollow don't help once they are stuck. Always replace with good stainless bleed nipples. I would even go as far as to suggest everyone does on their next brake fluid flush, change them all out for stainless before they corrode solid.

There is a caliper refurbishing place at Long Eaton, as they are local it might be worth giving them a call for advice and possible removal or remove the caliper and send it to Thomas at Pro Calipers. Hopefully you get it out without any trouble.

I do have a MIG welder if that is something you would like to try?
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911munKy
Spa-Francorchamps


Joined: 26 Nov 2014
Posts: 358



PostPosted: Sat Oct 07, 2017 4:22 am    Post subject: Reply with quote

I soaked mine in Plus Gas, applied heat to the surrounding area, then used a small socket & wrench to repeatedly open/close little by little whilst adding more Plus Gas until the nipple came out.

From Infrasilvers above post I now wish I had replaced them with Stainless ones as I don't fancy them snapping when I come to do it again.
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Griffter
Silverstone


Joined: 22 May 2016
Posts: 132



PostPosted: Sat Oct 07, 2017 6:56 am    Post subject: Reply with quote

Give the nipple a tap with a hammer from the top to try to break the corrosion seal before undoing. Not too hard. In addition to plusgas (down the hole in the nipple, overnight). Also, instead of just heaving on the spanner, pull the spanner in the “undo” direction, then tap with a hammer, again to try to break the seal and get the nipple to move. Above all, good luck...
 
  
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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1645
Location: east mids


PostPosted: Sat Oct 07, 2017 5:12 pm    Post subject: Reply with quote

Cheers gents
Thanks for the offer on the welder infrasilver very generous Thumb I do have a mig but I really don't want to use it.. too risky for my liking and the way this project has gone so far I'm pretty positive the end result would be a burnt out C4s Sad
Anyways... I managed to get another nipple undone on other caliper using Demorts back and forth method I learnt earlier on another siezed bolt earlier in the project ...
so I've now bled one chamber on each caliper... this side did have a lot of air in.. whilst the other side had hardly any... my drive does slope left to right slightly so maybe it's that Dont know 2 done 2 to go... half way there is guess Laughing
So since the freeze spray seemed to work... I've put some more on the other 2 and will attempt again in the morning....
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Last edited by paul987 on Sat Oct 07, 2017 9:01 pm; edited 1 time in total
 
  
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diverzeusy
Hockenheim


Joined: 10 Nov 2012
Posts: 743
Location: Doncaster UK


PostPosted: Sat Oct 07, 2017 6:31 pm    Post subject: Reply with quote

been hear when putting HEL performance stainless hoses on, everything was seized, all the previously mentioned is good advise so nothing really to add except for be patient and good luck Thumb
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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1645
Location: east mids


PostPosted: Sun Oct 08, 2017 6:03 pm    Post subject: Reply with quote

Well I still haven't got the other 2 undone using the more gentle methods... But the peddle does seem firm... Dont know
I'm still waiting on my new titanium nipples to arrive with it being the weekend and all that...
I shall try a little more aggressively with the hammer and socket when they arrive...
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11342
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Oct 08, 2017 6:10 pm    Post subject: Reply with quote

Isn't the bleed process a bit tricky with the abs and need some special method to do it?
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Demort
Estoril


Joined: 21 Mar 2015
Posts: 3501
Location: Sussex


PostPosted: Sun Oct 08, 2017 6:26 pm    Post subject: Reply with quote

Normal bleeding is fine , you only need a tester if the valve body / abs pump is replaced or has bled out which cant really happen on the car .

If the pedal is hard then you have bled the system .. to continue now will probably mean snapped bleed nipples ..

If i was you id stop while i was ahead for now Smile
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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1645
Location: east mids


PostPosted: Sun Oct 08, 2017 7:21 pm    Post subject: Reply with quote

alex yates wrote:
Isn't the bleed process a bit tricky with the abs and need some special method to do it?


I asked the same thing Alex...but Demort put me right Thumb
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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1645
Location: east mids


PostPosted: Sun Oct 08, 2017 7:33 pm    Post subject: Reply with quote

Demort wrote:
Normal bleeding is fine , you only need a tester if the valve body / abs pump is replaced or has bled out which cant really happen on the car .

If the pedal is hard then you have bled the system .. to continue now will probably mean snapped bleed nipples ..

If i was you id stop while i was ahead for now Smile


What!! Quit now and miss out on all the fun Laughing
I was thinking exactly the same thing... infact I was just getting my wheels ready to put back on tomorrow Embarassed Grin

I'll still put the new nipples on the one's I managed to free off.. I'm hoping titanium one's will be harder to snap in the future Dont know
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wasz
Kyalami


Joined: 28 Dec 2012
Posts: 1865


1999 Porsche 996 Carrera 2

PostPosted: Tue Oct 10, 2017 10:21 am    Post subject: Reply with quote

Don't use mole crips or a spanner on a bleed nipple!


My method:

Tap tap tap them with a hammer.

Chuck a few kettles of boiling water on them (or use better heat)

Use the T handle in your socket set (yes that thing you never use)

Use a 6 point socket

Use the T handle to apply equal rotational force to the nipple.

Any spanner or ratchet will apply a horizontal moment as well as a rotational moment which will snap the nipple.

Always use the T handle.
 
  
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