ChrisCope
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| posted on 14/10/24 at 09:56 AM |
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Brake Line Adapter Unions?
Hi all, first post with a new account. I'm Chris (used to be iti_uk on here but couldn't access that account since I forgot my password and
the email account it was registered to was deleted a long time ago  )
I have a situation where I need to join an M12x1 double flare brake hose to a M10x1 double flare brake hose (male-male).
My car has this union block from the factory (M10 - M10) (pic courtesy of random ebay ad). In my mind, I would be re-machining this block, or
fabricating an equivalent to accept M10 and M12 double flare lines.
[img]https://i.ebayimg.com/images/g/Ec8AAOSw58Njot44/s-l960.webp[/img]
Does anyone know any good contacts who can do this? Or even whether adapters like this already exist?
The reason for all of this is that I'm using a non-standard brake booster and master cylinder in my car, and the only master cylinders I can find
in the correct bore and mounting flange (I don't want to use adapter plates) come with M12x1 brake line ports, whereas my car uses M10x1. The car
already has a factory brake line "break" block (I believe where a proportioning valve is otherwise installed in other markets) and this
seems to be a natural transition point for the brake lines without increasing the number of joints in the system (this is why I don't want to use
M12 male - M10 female afapters if possible).
Hope that makes sense.
TIA
Chris
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ChrisCope
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| posted on 14/10/24 at 11:36 AM |
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Maybe another possibility - considering the brake lines are 3/16 (4.75mm), would anyone be able to comment for/against using these;
https://www.rallydesign.co.uk/product_info.php?cPath=562_85_1923_1210&products_id=9956
First I've heard of a fitting allowing a 3/16 line to connect to a M12x1 fitting...??
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russbost
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| posted on 14/10/24 at 12:31 PM |
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No reason not to use the M12 pipe unions on 3/16 pipe, such unions have been around for years, pretty sure some fitted as OE. But would that not mean
your block
Link to image
would now need to be 12mm to 12mm - dunno if such connectors exist, I couldn't find any?
Oli at Furore products could make you a replacement hose with whatever ends you want on it to give a direct male to female joint for far less than any
specialist machining.
Link to custom hoses
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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ChrisCope
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| posted on 14/10/24 at 12:59 PM |
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I'm thinking that this M12 would be the connection on the master cylinder, with the 3/16 line coming out of it which would then be attached to
that block using the standard M10 fittings.
Thanks for that contact, I'll make contact soon  .
As long as there is no problem with the 3/16 line flare dimensions and the normally-1/4" line port then I will go with that as the simpler
more-off-the-shelf solution.
edit: breaking out the verniers, the ID of the 3/16 line is around 3.1mm, the port internal diameter on my stock M10-based brake components seems to
be ~2mm, and the port internal diameter on my M12-equipped master is ~3.5mm. The "outer diameter" of the seated portion of the flare on the
line (if that makes sense) is ~5.4mm. So, with a 3/16 line, of the 1.15mm mating surface of the flare, with an M10-based fitting you get all of the
1.15mm, whereas with the M12-based flare, you get 0.95mm mating with 0.2mm inward-overlap of the line's flare into the port. Not sure how that
compares with using the 1/4" line as I don't have a sample to check, but I think ~80% mating contact of the standard M10 fitting would be...
okay??
[Edited on 14/10/24 by ChrisCope]
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adithorp
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| posted on 14/10/24 at 05:34 PM |
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Can't you just put m10 on one end of the pipe ans m12 on the other?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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ChrisCope
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| posted on 14/10/24 at 06:20 PM |
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quote:
Originally posted by adithorp
Can't you just put m10 on one end of the pipe ans m12 on the other?
Yes, that is the plan, my question now is whether the M12 fitting with a double-flared 3/16" line will seal reliably in the master
cylinder's port which was designed for a double-flared 1/4" line.
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