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paul987
Barcelona


Joined: 27 Feb 2015
Posts: 1447
Location: east mids


PostPosted: Thu Sep 07, 2017 6:30 pm    Post subject: Reply with quote

Evening gents... OK so now I've sorted the coffin arms and track rods... I can finally continue with the brake lines.... Confused
I have replaced the hard line on the calipers.. I have also bought some shiny new Goodridge hoses to replace the old rubber lines... BUT.. There's a slight problem with the nut being rusted solid on the no.9 hard line.. wack I have bought a 11mm flare nut spanner it seems slightly too big.. I have bought a 10mm flare nut spanner it's too small.. so it needs a 10.5mm Question Dont know I suspect it's imperial.

So has anyone got any ideas Question I really don't want to replace the no. 9 line.. so my thoughts are... if I cut the nut off what and used a pipe cutter to chop the flange off... Embarassed I could then put a new male nut on the old line then reflange it Question
Is there any obvious flaws in my theory? ?
Thanks
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3241
Location: Sussex


PostPosted: Thu Sep 07, 2017 7:03 pm    Post subject: Reply with quote

Ive been keeping my eye on this thread as i did wonder if all the lines would come undone .

Its either a 10 or 11 mm as there is no imperial anything on Porsches and there is no 10.5 .. it should be an 11 which has corroded .

Your choices ..

Replace No.9 ..

Do a cut and join on No.9 .. i dont recomend that ..

Use mole grips on the corroded nut and either a spanner or more mole grips on the flexi pipe .. youll need to force it out of the bracket or at least far enough so it can be turned as the bracket locates the flexi pipe ... and whilst holding the metal pipe ( no.9 ) in place you will undo and twist off the flexi pipe .

Its important not to allow the metal pipe to twist .. it wants to be held ridgid as too much twist will fracture it .

Your kinda doing the job backwards basically .

You could cut the nut and re flair but if its steel pipes then i wish you the very best of luck there and if not it may well be too short to reach the pipe ... i think go down this route if my above suggestion doesnt work Smile
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paul987
Barcelona


Joined: 27 Feb 2015
Posts: 1447
Location: east mids


PostPosted: Thu Sep 07, 2017 9:46 pm    Post subject: Reply with quote

Demort wrote:
Ive been keeping my eye on this thread as i did wonder if all the lines would come undone .

Its either a 10 or 11 mm as there is no imperial anything on Porsches and there is no 10.5 .. it should be an 11 which has corroded .

Your choices ..

Replace No.9 ..

Do a cut and join on No.9 .. i dont recomend that ..

Use mole grips on the corroded nut and either a spanner or more mole grips on the flexi pipe .. youll need to force it out of the bracket or at least far enough so it can be turned as the bracket locates the flexi pipe ... and whilst holding the metal pipe ( no.9 ) in place you will undo and twist off the flexi pipe .

Its important not to allow the metal pipe to twist .. it wants to be held ridgid as too much twist will fracture it .

Your kinda doing the job backwards basically .

You could cut the nut and re flair but if its steel pipes then i wish you the very best of luck there and if not it may well be too short to reach the pipe ... i think go down this route if my above suggestion doesnt work Smile


Thanks Demort
The double mole grips method is getting my vote Thumb The rest of the no.9 pipe is in good condition.
But one question.... will the old nut be reusable if I get it off with the mole grips? Basically will I be able to use the mole grips or spanner to tighten it to the new flexible hose? Or will no.9 pipe need to be replaced?
Thanks
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wasz
Albert Park


Joined: 28 Dec 2012
Posts: 1708


1999 Porsche 996 Carrera 2

PostPosted: Thu Sep 07, 2017 10:01 pm    Post subject: Reply with quote

I had this problem.

But my brake lines were looking a bit manky, especially up above the steering rack where you can't normally see them.

So I replaced them with cunifer back to the pump.
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3241
Location: Sussex


PostPosted: Fri Sep 08, 2017 7:09 pm    Post subject: Reply with quote

If you use mole grips then you remove the flexi from the metal pipe and refit it the same way .. it wont be pretty but then it isnt now due to the corrosion.

You could use something else rather than mole grips if you want as thats just an example. .. there are pliers out there with plastic jaws .

The best way is obviously to replace all the pipes needed but this was an unexpected failure and so a quicker repair for now is IMHO fine .

If it doesnt work then you are left with replacing no.9 .. i think reflairing might be a problem .

Lets face it if it dont leak then theres nothing wrong with it , i dont condem things because they are ugly Very Happy

Anyways you got my number if you need it !
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ragpicker
Paul Ricard


Joined: 14 Apr 2013
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PostPosted: Fri Sep 08, 2017 8:06 pm    Post subject: Reply with quote

I usually heat them up with a blow torch, the crud falls off them and they unseize too. Sometimes you get the brake fluid catching fire as it drips out which is always interesting.

Another favourite trick is when the flexi pipe is siezed into the calliper and you heat the calliper so much the flexi blows off and makes a sound like a gunshot.

Neither of the above are the best way to do the job by the way.... I hadn't thought of the double mole grip method Embarassed
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diverzeusy
Hockenheim


Joined: 10 Nov 2012
Posts: 727
Location: Doncaster UK


PostPosted: Fri Sep 08, 2017 8:45 pm    Post subject: Reply with quote

cunifer/copper comparison, just so you can identify what you are buying, copper is the bottom one and as mentioned, it is about the same colour as a 2p coin Thumb
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paul987
Barcelona


Joined: 27 Feb 2015
Posts: 1447
Location: east mids


PostPosted: Fri Sep 08, 2017 10:33 pm    Post subject: Reply with quote

Demort wrote:
If you use mole grips then you remove the flexi from the metal pipe and refit it the same way .. it wont be pretty but then it isnt now due to the corrosion.

You could use something else rather than mole grips if you want as thats just an example. .. there are pliers out there with plastic jaws .

The best way is obviously to replace all the pipes needed but this was an unexpected failure and so a quicker repair for now is IMHO fine .

If it doesnt work then you are left with replacing no.9 .. i think reflairing might be a problem .

Lets face it if it dont leak then theres nothing wrong with it , i dont condem things because they are ugly Very Happy

Anyways you got my number if you need it !


Cheers Demort your a good un Thumb
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paul987
Barcelona


Joined: 27 Feb 2015
Posts: 1447
Location: east mids


PostPosted: Fri Sep 08, 2017 10:37 pm    Post subject: Reply with quote

ragpicker wrote:
I usually heat them up with a blow torch, the crud falls off them and they unseize too. Sometimes you get the brake fluid catching fire as it drips out which is always interesting.

Another favourite trick is when the flexi pipe is siezed into the calliper and you heat the calliper so much the flexi blows off and makes a sound like a gunshot.

Neither of the above are the best way to do the job by the way.... I hadn't thought of the double mole grip method Embarassed


Cheers Ragpicker your a good un too... But also a slightly dangerous un.. Laughing Thumb
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paul987
Barcelona


Joined: 27 Feb 2015
Posts: 1447
Location: east mids


PostPosted: Fri Sep 08, 2017 10:52 pm    Post subject: Reply with quote

diverzeusy wrote:
cunifer/copper comparison, just so you can identify what you are buying, copper is the bottom one and as mentioned, it is about the same colour as a 2p coin Thumb


Thanks diverzeusy Thumb I have just explained to my wife how someone had posted about spotting cunifer by its colour.. she's just said "conifers are always green they don't turn copper" eh!
I do wonder obout her sometimes Dont know
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mr gill
Monza


Joined: 21 Feb 2011
Posts: 204
Location: The Black Country


PostPosted: Sat Sep 09, 2017 3:14 am    Post subject: Reply with quote

Kunifer can look indistinguishable from copper, the nickel content can range from over 93% down to 68% depending which alloy grade is used...
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X51 996
Trainee


Joined: 14 Nov 2016
Posts: 53
Location: Surrey


PostPosted: Sat Sep 09, 2017 1:40 pm    Post subject: Reply with quote

mr gill wrote:
Kunifer can look indistinguishable from copper, the nickel content can range from over 93% down to 68% depending which alloy grade is used...


Are you sure that's correct? Smile

I thought Cunifer/Kunifer was mainly copper, with a little nickel etc added not the other way round - ie circa 90% copper not mainly nickel.

The finish may vary slightly but generally copper coloured just a little lighter (bronzey/gold) Thumb
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3241
Location: Sussex


PostPosted: Sat Sep 09, 2017 7:03 pm    Post subject: Reply with quote

ragpicker wrote:
I usually heat them up with a blow torch, the crud falls off them and they unseize too. Sometimes you get the brake fluid catching fire as it drips out which is always interesting.



Thats one thing we would do at work .. i wont say we know what we are doing Razz but we do have plenty of fire extinguishers Very Happy
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mr gill
Monza


Joined: 21 Feb 2011
Posts: 204
Location: The Black Country


PostPosted: Tue Sep 12, 2017 1:35 am    Post subject: Reply with quote

X51 996 wrote:
mr gill wrote:
Kunifer can look indistinguishable from copper, the nickel content can range from over 93% down to 68% depending which alloy grade is used...


Are you sure that's correct? Smile

I thought Cunifer/Kunifer was mainly copper, with a little nickel etc added not the other way round - ie circa 90% copper not mainly nickel.

The finish may vary slightly but generally copper coloured just a little lighter (bronzey/gold) Thumb


Oops yes, thats what i meant to say, i wrote nickel instead of copper!
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diverzeusy
Hockenheim


Joined: 10 Nov 2012
Posts: 727
Location: Doncaster UK


PostPosted: Wed Sep 13, 2017 8:47 am    Post subject: Reply with quote

mr gill wrote:
X51 996 wrote:
mr gill wrote:
Kunifer can look indistinguishable from copper, the nickel content can range from over 93% down to 68% depending which alloy grade is used...


Are you sure that's correct? Smile

I thought Cunifer/Kunifer was mainly copper, with a little nickel etc added not the other way round - ie circa 90% copper not mainly nickel.

The finish may vary slightly but generally copper coloured just a little lighter (bronzey/gold) Thumb


Oops yes, thats what i meant to say, i wrote nickel instead of copper!

Please please just look at my picture of the two, side by side in the picture I posted earlier in the thread. It is very clear how they look, frustrated
Now back to making brake pipes up Smile
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paul987
Barcelona


Joined: 27 Feb 2015
Posts: 1447
Location: east mids


PostPosted: Thu Sep 14, 2017 8:33 pm    Post subject: Reply with quote

OK so I finally got it sorted today Dance Tap
I tried a few days ago with no joy at all.. one of the molegrips I was using was crap and had way to much play in them.... so bought another better quality pair of molegrips...
2 secs it was off... nut and line salvaged by twisting the flexible line end (as recommended by Demort, I thank you sir)
Thanks for everyone's imput Thumb






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