andyd
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 posted on 20/4/02 at 09:43 PM |
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Brake flaring - single or double?
Being a novice mechanic I have a question...
Q. Should I be flaring my brake pipe ends with a single or double flare?
I'm guessing that as the hole seems to have a cone shape going away the single flare would seem to fit the shape better.
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Steve Crees
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| posted on 21/4/02 at 06:54 AM |
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Double flare every time as it gives better sealing
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Dick Axtell
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| posted on 22/4/02 at 05:36 PM |
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Assuming the following meanings :-
a)Double flare = Flare cone wrapped back inside itself (2 x wall thickness)
b)Single flare = Flare in double cone form, with dia going min-max-min;
Single flare used in most "standard" Euro/UK brake ports. Double flare used by Japs, and sometimes in ally cast bodies (because steel or brass
inverted cone inserts are used). The inverted cone seat determines the use of the double flare.
From lengthy experience in brake engineering, the double cones were preferred where repeated tightening/untightening was needed.
Dick Axtell (ex Girling/LucasGirling/Lucas Automotive/LucasVarity/TRW).
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David Jenkins
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| posted on 23/4/02 at 08:06 AM |
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quote:
Single flare used in most "standard" Euro/UK brake ports. Double flare used by Japs, and sometimes in ally cast bodies (because steel or brass
inverted cone inserts are used). The inverted cone seat determines the use of the double flare.
Dick,
This is one area where most DIY car books are appalling - I presume that they're scared of being sued by some pillock who can't follow
instructions.
The best info I had to date was "single flares for male tube fittings and double flares for female" (this is for Ford 10x1mm fittings on Escort m/c
and rear axle, and Cortina front disc calipers).
Now you've confused me with your (undoubtedly good) recommendations... 
So, in my case, it's single flare for everything?
David
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stephen_gusterson
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| posted on 23/4/02 at 09:36 PM |
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As someone that struggled like mad to understand how to make a flare when his tool came without instructions, I can hardly claim to be an expert here.
However I have piped up my car sucessfully now, so here goes!
A single flare is the one that looks a bit like a 'mushroom' head. A double is when you push the tool into that flare to bend it back into the
'belled out' shape.
On my car, some of the existing fittings already dictate which to use. A concave milled hydraulic item can only take a single flare.
When I had to join items together I used a double flare.
Once you get the hang of the tool its a synch. Just get a tube cutter and a small needel file to chamfer the ends before flaring
atb Steve
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