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PostPosted: Mon Jun 29, 2015 11:39 am 
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Joined: Sat Jan 10, 2009 12:24 am
Posts: 7
Location: Beauly, Scotland
Mem No: 1303
Member until: Aug 2019
I urgently need to get a new brake pipe made up (Rear RH - 70.20.18 in Workshop Manual), and am struggling to find the correct size/type of union nuts to fit the existing original brake components (wheel cylinders/3-way adapters/etc). The existing (original) union nuts look like they might be 3/8" UNC with a tapered thread (Possibly!). Can anybody please supply me with the correct size/designation of the union nuts required, together with the correct designation (if any) of the dies that should be used to swage the ends of the brake pipe?
Many thanks indeed for any help you can provide!

3 hours later ... I subsequently found Martin's [b][u]excellent[/u][/b] spreadsheet listing all nut/union sizes. THANKS MARTIN!!! Followed this with a 30-mile trip to get new pipe made up with correct fittings, and I'm now waiting for paint on the new pipe to dry before fitting it.
So ... Problem sorted thanks!! :D :D :D


Last edited by billfraser on Mon Jun 29, 2015 4:49 pm, edited 1 time in total.

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PostPosted: Mon Jun 29, 2015 1:52 pm 
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Joined: Fri Jun 15, 2007 12:41 pm
Posts: 9578
Location: Exbourne Devon
Mem No: 1893
Member until: Aug 2019
Hi Bill the unions should all be the same into the wheel cylinder use 3/16 pipe. The flaring tool will be option 1 / bubble or option 1 & 2 to give the concave flare, just copy what you already have.

to fit wheel cylinders....male 3/8-24 unf

to fit the brake hose ...female 3/8-24 unf

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