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Embarrasing Newbie Question No3 - Brake Pipe Flare, Sae Or Din?


FERRINO

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Evening all - my new expensive brake flaring tool turned up tonight:-

 

20140423_1937561_zps60975a43.jpg

 

 

The kit states it will do SAE or DIN Flares and has the dies to suit.

 

I'm assuming I need to use the DIN flare for Sierra fittings and the 3 way valve etc?

 

Cheers

Tony

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The Sae is commonly known as a double flare.

The DIN is a single flare.

 

It depends on whether the union your connecting to is Convex or Concave on its contact / seal face.

 

If Convex you need a Double flare and vice versa for Concave.

 

HTH,

 

Nick.

 

P.S. To not know something and ask a silly question makes you a fool for 2 minutes.

 

To not know something and not ask makes you a fool for life.

 

:drinks:

Edited by Shaft
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Guest Ian & Carole

 

Tony

useful from about 4 mins in.

 

As I said to you before it is a bit of a dark art and hard to explain which flare you need.

Have a look into the 3 way valve and see what it looks like in there, if it has a "male" appearance then you need a double flare, that's when you make a convex flare with the mandrel then make it concave by using the point of the anvil.

 

If any look to be "female" then you use the single flare just using the mandrel.

 

HTHs

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:good: Thanks guys - much appreciated.

 

The male/female thing is not a problem - I know I need males for the 3 way union and the master cylinder etc, its just that there seems to be 2 types of male flare - the DIN and the SAE which have very slightly different profiles (and hence different inserts in this kit). There is a third insert for pushing the tube 'inside' to create the female flare.

 

The DIN male flare seems to have a nice flat bottom where the nut pushes up against it whereas the SAE seems to have a slight angle to the flare at that point.

 

Think I've got it sussed now though - its a bit too late to be heading out and trying a few in the garage now, but will have a practice tomorrow night and post up the results to see what people think if that's ok?

 

I've got Friday off work to totally re-do all the brake lines - so I'd better be an expert at it by then lol!

 

Cheers again

Tony :)

 

------

 

Edit - Just found a pic which explains the original question a bit better. Both these are male flares - one is DIN and one SAE (which is states is now obselete). My kit has inserts to create both these profiles as well the 'inverted' female one:-

 

brake-line-ftg2_zps0002ce0d.jpg

 

So it looks like to create a male I just use the DIN die in one operation - but to create the female I use the SAE die and then use the third 'pointed' die to push that down and create the female. I hope that's correct?

Edited by FERRINO
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The slight difference under the head between the 2 types is due to the slight difference in chamfer on the male threaded unions depending on whether you've got Metric or Imperial fittings.

The difference is very slight and with the pipes being Copper or Cupri Nickle there malleable enough to 'deform' into shape.

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The slight difference under the head between the 2 types is due to the slight difference in chamfer on the male threaded unions depending on whether you've got Metric or Imperial fittings.

The difference is very slight and with the pipes being Copper or Cupri Nickle there malleable enough to 'deform' into shape.

 

Ahhh brilliant - cheers Nick. So you would use the SAE flare for Imperial fittings then, that was the missing bit of info I couldn't seem to find on the net.

 

Cheers again all

Tony

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Spot on Tony.

If I recall from my apprentice days correctly, SAE is "Standard (of) Automotive Engineers"?

 

You'd still need the SAE if using Imperial fittings. Obsolete only refers to new things where as we're all working with older stuff. :drinks:

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it comes in useful once you get the hang of it. My brother broke the brake line on his stilo as he hadn't done brake hose before and was a bit too over enthusiastic with the spanner.

 

So i cut the pipe back and made a short joiner pipe in about 10mins and got it all back working. MOT the next week didn't even mention it.

 

Going to have to do the rear lines on my bmw soon as they are a bit corroded.

 

A lot cheaper than the garage doing them.

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Not an embarrassing question we have all learned something new, about brake flaring tools and ends.

 

You cannot argue this is a significant benefit of the club - wise words of experience and knowledge, priceless.

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