Leaking nipples... Brake nipples - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 19 (permalink) Old 04-16-2019, 11:47 AM Thread Starter
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After cleaning up my calipers I replaced my brake hoses with new HEL braided ones, but had a nightmare bleeding my front brakes...

Leaking nipples... Brake nipples-screenshot_20190416-163706_gallery_1555429082086.jpg
Leaking nipples... Brake nipples-screenshot_20190416-163657_gallery_1555429108806.jpg

I bought a vacuum pump and it just consistently sucked air into the system. I eventually found that the air was coming from between the threads of the bleed screws. I ended up doing it the old fashioned way and it worked fine. My brakes were great and super sensitive.

However, after the first ride I noticed fluid on the calipers. It turns out the nipples were leaking. I had torqued them up to 7nm as per the manual.

I decided to replace them but could only get mild steel ones at short notice...

Leaking nipples... Brake nipples-screenshot_20190416-163547_gallery_1555429291344.jpg

After swapping them out and going for a ride... The problem persists.

I did have to "break" the old nipples out when I did the first bleed. They were in very tight so I guess whoever did the brakes last has overdone it.

I've now tightened them up way more than recommended but still leaking around the threads.

Any suggestions? As I understand it it's not the thread that seals them so don't see how retapping will help...

Last edited by Mashers; 04-16-2019 at 11:53 AM.
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post #2 of 19 (permalink) Old 04-16-2019, 01:40 PM Thread Starter
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FT...?
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post #3 of 19 (permalink) Old 04-16-2019, 02:20 PM
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I've heard of people using Teflon tape (a.k.a plumbers tape). Personally, I've never used it but it seems like a relatively harmless and inexpensive thing to try.

Bring out the gimp.
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post #4 of 19 (permalink) Old 04-16-2019, 03:03 PM
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Quote:
Originally Posted by Mashers View Post
... As I understand it it's not the thread that seals them so don't see how retapping will help...
That is correct - it is the tapered seat at the bottom that is the 'seal' - it leaks past the threads because it is first leaking past the actual seal.

Looking at your new nipples, it appears the taper is not exactly the same (well at least originals look more pointed and replacements rounded)
- I would get some 'better' nipples, or even re-try the originals
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post #5 of 19 (permalink) Old 04-16-2019, 04:56 PM
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Are you sure it is not residual? I always get some sipping out after a bleed. I wipe it and watch if it will sip out again, it might do a tiny drip once more, and then stops. With oil, a drop looks like a lot.
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post #6 of 19 (permalink) Old 04-16-2019, 05:10 PM
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After installing nipples and re-torquing to spec, give them a good spray of brake cleaner, wipe down, and re-check.

I had nipples that didnít want to stop leaking. Thought I wasnít tightening enough even though it was set to spec. Turns out it was residual, as previously mentioned. Brake cleaner saved the day!


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post #7 of 19 (permalink) Old 04-16-2019, 06:06 PM Thread Starter
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Quote:
Originally Posted by Speedy Russ View Post
I've heard of people using Teflon tape (a.k.a plumbers tape). Personally, I've never used it but it seems like a relatively harmless and inexpensive thing to try.
As I understand it, it's not the threads that seal so thread lock or ptfe may help but isn't fixing the issue.
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post #8 of 19 (permalink) Old 04-16-2019, 06:08 PM Thread Starter
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Quote:
Originally Posted by DEcosse View Post
Quote:
Originally Posted by Mashers View Post
... As I understand it it's not the thread that seals them so don't see how retapping will help...
That is correct - it is the tapered seat at the bottom that is the 'seal' - it leaks past the threads because it is first leaking past the actual seal.

Looking at your new nipples, it appears the taper is not exactly the same (well at least originals look more pointed and replacements rounded)
- I would get some 'better' nipples, or even re-try the originals
Agreed. I noticed the angles and diameter was different so I replaced with the old... No luck and the problem was still there (on all three brakes!)
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post #9 of 19 (permalink) Old 04-16-2019, 06:10 PM Thread Starter
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Quote:
Originally Posted by Evangelos K View Post
Are you sure it is not residual? I always get some sipping out after a bleed. I wipe it and watch if it will sip out again, it might do a tiny drip once more, and then stops. With oil, a drop looks like a lot.
Definitely not residual. I could squeeze the brake and hold it for 10 seconds and a drip would appear around the thread.
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post #10 of 19 (permalink) Old 04-16-2019, 06:23 PM Thread Starter
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I think I fixed the problem tonight. I drained the system, cleaned the bleed holes and took a look inside. Each of the calipers had a slightly misshapen bleed hole under the screw. It didn't make sense to me that the cone of the nipple could sit in a hole that was oval or had ridges... I should have taken a photo really.

So I got the drill out with a bit just the right size and rounded off the holes in the calipers. I've cleaned the filings out, filled and bled the system and it doesn't appear to be leaking now. 👍

I went back to using the new nipples again because my "FT" attempt ruined them 😳
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