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Twin disc caliper modification?
SteveD CB500K0:
I didn’t even know the cunifer was a thing.
Had to Google it
Sent from my iPhone using Tapatalk
sprinta:
--- Quote from: 71 V12 on February 11, 2020, 06:26:18 PM ---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.
(Attachment Link)
--- End quote ---
Are you indicating that with the 'olive' removed both sides have the same seat face such that the nipple can be fitted to either side without any further modification?
71 V12:
Hi Andy,
Visually the inlets look the same. The only difference that I can see is the hole at the bottom of the inlet on the brake pipe side is about 0.5mm bigger than the bleed inlet to allow for the olive insert.
Therefore to fit the olive in the bleed inlet that hole would need to careful enlarged. I guess you would want The olive to be a slight interference fit and perhaps a small tab of thread lock to seal it well.
Having said all of this, I really hope that the pipe will seal with right brake tube nut and OP1 flare.
Bryanj:
Kunifer is way easier to bend, never rusts and seals better as it forms to the shapes better.
The only vehicle i would use original steel on would be a Citroen with hydromatic suspension as they have very odd ends with rubber seals
sprinta:
--- Quote from: sprinta on February 10, 2020, 05:19:58 PM ---I am considering doing a twin disc conversion on my 73 CB750 K2 and currently looking at all the parts I would require to do the modification.
On looking at the caliper whilst it it is straightforward to fit to the RH side they are handed in the sense that the nipple will now be closer to the fork tube and the hydraulic pipe now furthest away as the seats for the nipple and hydraulic pipe are different with the nipple using an inverse cone shape and the pipe a raised cone seat.
On looking at the relevant parts book page, see attached, there is an unnumbered part that looks to be some sort of olive insert above the pipe connection position.
Can anybody advise if this a push in seat that can be removed or if there is a relatively simple process so the nipple and hydraulic can be fitted as a mirror image of the LH side with the hydraulic pipe close to the fork leg?
--- End quote ---
Removing the 'olive' is fairly straightforward.
The bore of the olive is around 3.2mm dia and as such will take an M4 tap.
After tapping a few threads into the olive it can simply be drawn out with an M4 screw, nut and washers, see attached.
With the olive removed both threaded holes and seats are the same, at least on my caliper. So all that is required is to press the olive into the original nipple bleed hole and the screw the bleed nipple into the original brake pipe position.
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