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Old 04-09-2017, 11:43 PM
Rhino Rhino is offline
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Default C5 Master Cylinder Tube Nuts

One last piece of the puzzle for my brake install is tube nuts for the C5 master cylinder.

It appears that the front port is M12 x 1.0, and the rear is M12 x 1.5. The issue I'm having is that I can't find anyone who can supply the M12 x 1.5 tube nut for use on a 3/16 line.

I've seen people mention they were able to find M12 x 1.5 fittings for 3/16 tube, however I have yet to come across a thread which provides part numbers or where they were sourced from.
Does anyone have any guesses to where I could source them?

Baring any breakthroughs there:
I have the stock fittings. The rear port originally used a 6mm tube. The difference between 6mm (.236) and 3/16 (.187) is a hare under .005
While that seems like a relatively small difference, I don't want to do anything to jeopardize my safety on a critical system such as brakes. Could the original nut be reused for the 3/16 lines? Another option I'm considering is using 6mm line from the rear port into my proportioning valve.
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Old 04-10-2017, 07:49 AM
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dontlifttoshift dontlifttoshift is online now
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.049" is a lot, I wouldn't use the factory nut on a 3/16' line.

Is this the flare nut you are looking for?

BQ9193 M12 × 1.5 11.6mm 45° 13mm 3/16″

from http://brakequip.com/products/hardware/male-tube-nuts/
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Old 04-10-2017, 08:20 AM
Rhino Rhino is offline
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Yep, that's exactly it. Thank you. I could have swore I checked them, but obviously missed it.

It also appears they have a distributor within a few miles of here.
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Old 04-14-2017, 03:05 PM
im4u2nvss im4u2nvss is offline
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Not sure if these adapters would work for you or not but it is what I am using. https://www.summitracing.com/parts/aaf-all41012
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