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Twin disc caliper modification?

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71 V12:
The internal dimension of the brake line inlet on the Caliper is identical to bleed nipple inlet except the port to the piston chamber is approx 0.5 mm larger. As Bryan mentions it is not threaded all the way. The thread is 1.25mm pitch.

Photo of the olive below.



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71 V12:
This is brake pipe flare and long M10 x 1.25 tube nut I will try.

Bryanj:
Id sooner see kunifer not steel pipe

sprinta:

--- Quote from: 71 V12 on February 11, 2020, 04:39:54 PM ---The seat is the same as the bleed valve side. As I mentioned I am hoping that a bubble flare will seal without the need for the unobtainium olive.

--- End quote ---

Hi

Olive is available from Yamiya. The attached photos from their site.

It is always possible that you could cut the appropriate nipple seat into the existing olive whilst still in place? It might rotate during the process and have to be removed? A new olive insert could be machined with the necessary seat for the nipple and then pressed in?

The suggested reverse flare on the hydraulic might work in the existing nipple seat face?

You can also increase the depth of the thread with the appropriate bottom tap

71 V12:
I would like the conversion to look as near as possible a mirror of the left brake. I therefore hope to use the rear Caliper inlet for the brake pipe on the new right side brake, if that makes sense.

Plan A is to try a long brake tube nut that is not fully threaded as in the image above with the OP1 (bubble flare). If this seals great, job done.

If not

Plan B drill the rear Caliper port on the right Caliper and fit the removed olive which will clean up and use the OE brake nut and OP2 double flare.

Not sure why Bryan has a preference for cunifer, Honda used steel as do all other vehicle producers to this day. I think the surface coating may be better these days to prevent corrosion.

Anyway still at the parts gathering and refurbishing stage. I have most of the parts and fixings now except the brake line wire fixing bracket, but I will leave this until I’m into the job and can review the viable options.

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