Need advice, Rear brake hose replacement issue

[KCinSB]

‘93 K1100RS ABS1. Replacing brake hose from rear master cylinder to the ABS 1. The new hose is a taper seal, Original hose seems to be a simple flat crush seal? Can this possibly work? Working the job now.

[KCinSB]

 New issue. The banjo on the new line is .07 Inch slimmer than the OEM line. This means the banjo bolt bottoms in the hole before the crushed washers seal. No joy!!

[koapono]

I took my old hose to a hydraulic hose shop and they matched it perfectly.
From your pictures you seem to be dealing with flared (new) and tapered thread fittings, not compatible.
It’s mind boggling how many variations exist in the pipe/tubing world.
G’luck

[KCinSB]

Anybody know what this type of hose end is called. Found it in the rear master cylinder, ‘93 K1100RS, ABS I. Hose from MC to the ABS. Really don’t know what kind of seal system this is. The swivel nut bears down on the end, so kind of like an integral crush washer. Odd in my opinion to be used in a this application. The 1st replacement part (shown above photos) came with a conical type end. The MC does not look to have a tapered seat in the hole.

[Laitch]

Glad you asked. I didn't know until I looked it up. It seems to be a DIN bubble flair fitting and as you surmised, designed to crush flat to make a seal. It's commonly used in European brake lines. This tech describes differences.

[KCinSB]

Thank you. Your description sounds like the part. Cannot see the Tech info referenced but sure makes sense.
Also, some years ago while working on the headlight switch/system, I learned that my Lights OFF until switched on manual indicated it is a ERO model bike. That would also fit with this issue then!!
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HMMmmmmm. Do you think the ERO issue could also be the answer to the Banjo design difference? Slimmer by approx .070”?  If so, then possibly my fault for ordering a part without proper vehicle ID input.

[Laitch]

Do you think the ERO issue could also be the answer to the Banjo design difference? Slimmer by approx .070”?  If so, then possibly my fault for ordering a part without proper vehicle ID input.

If ERO means European in your language, then the lights-off switch is a European model feature, but the brake parts are likely the same in either country. The light switch could have been the previous owner's aftermarket addition. I'd rather have the lights on automatically when riding during the day but I have no flair for style.

You're likely using Mac OS Catalina if you can't see the video I posted. Switch to Chrome or Firefox; however,  click here for numerous references.

Now, put the last seven digits of your Brick's VIN into this checker to determine its country of origin.

MaxBMW's parts fiche seems to show an ABS line with that bubble flare so I don't believe it's confined to European versions. If you're replacing parts send hi-res photos of the specific parts to the fabricator along with the Brick's manufacturing information. As you have indicated, what you received clearly indicates failure of communication.

You'll get it sorted eventually.

[frankenduck]

What's the source?

I get my SS lines from Motobins in the UK and have never had any issues.

I bought a kit of lines for my 94 RS from Galfer once and one of the lines had the totally wrong fitting on one end. I sent the bad line back and some pics of the OEM factory line and their tech guy was very good (with quick turnaround) about making the correct line for me.

[KCinSB]

Laitch post Ref:  “…MaxBMW's parts fiche seems to show an ABS line with that bubble flare so I don't believe it's confined to European versions. If you're replacing parts send hi-res photos of the specific parts to the fabricator along with the Brick's manufacturing information. As you have indicated, what you received clearly indicates failure of communication.”

 The parts I sent back may have actually been OK. I have asked to be copied on the vendor reply to the supplier asking if the part is as intended. Hard for me to visualize that much taper forming the bubble, but I may be wrong! From the photo I copied, you can see the change when tightened is only 5deg. That is a nice bit of crush to seal, but certainly not Flat as my original removed.

[Laitch]

Laitch post Ref:  “…MaxBMW's parts fiche seems to show an ABS line with that bubble flare so I don't believe it's confined to European versions. If you're replacing parts send hi-res photos of the specific parts to the fabricator along with the Brick's manufacturing information.
The parts I sent back may have actually been OK. I Hard for me to visualize that much taper forming the bubble, but I may be wrong! 

Have you sent the vendors some photos of what you have—the three you've already posted showing the contact face of the flare and tube from which it is formed? It's unlikely that the ability to visualize has any bearing on the outcome unless you've had objective experience with the differing types of flares that might be involved.

What you have shouldn't be a mystery to manufacturers of these parts if they can see them clearly. A photo of the connecting fitting's mating surface would be helpful, too.

[KCinSB]

UPDATE:
Wasted a bunch of effort trying to order the 2 hoses from US vendors; Bob’s,Max, BMW of Ventura, even eBay, etc. Vendors all let me get finished and process the checkout,….. “will send a confirmation..” and then “No Stock”. Prices on the orders were all in the $125/155 range.
I was avoiding the idea of off shore supplier. THAT WAS DUMB! Motobins.co.uk. Have the parts, and shipped is shown, 1/2 the cost!?
How that can be is crazy, but a friend has had the same experience ordering MG parts. 4 Wheels/tires, heavy stuff!!, ordered from UK were much cheaper, and they got here faster than the local Moss Motors could do it. What’s up with the disparity? Anyhow, hopefully these parts will actually get here, and end the conundrum!

[KCinSB]

OFF TOPIC……..
So, while asking local folks about the fitting problem, a fellow that works Exotic cars sent a fun note:
“ One of my coworkers just got a running, driving full dress K bike for a dollar because it would have cost the PO more to fix the clutch than the bike was worth. He's in the depths of fixing it now. Of course, it needs more than just a clutch and everything is so deep in, it's crazy not to do it all at once.“

Boy, Ain’t that the truth!!  Wonder if that new owner comes here?

[Laitch]

UPDATE:.  . . What’s up with the disparity? . . .

The UK wants dollars and the parts are available because it's possible more Bricks were sold in the UK and the EU than in the USA. Cops in several countries over there were issued them, too. The total production of K1100 RS/LT was ≈34,000, according to BMW Group's Historic Model Archive but the total wasn't broken down by region on that site.
Regardless, suspense is building for the grand reveal in the next episode of Braking Bad.