Rear MC Fluid Leak?! - ZX6R Forum
 
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post #1 of 9 Old 04-09-2017, 07:14 PM Thread Starter
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Rear MC Fluid Leak?!

My rear MC on my 2007 ZX6R has started to leak after I've changed to SS lines. I noticed it and re-did the bleeding and replaced the washers. After that it was still leaking, so I bled the brakes again as well as the washers. Now, it's still leaking. I'm positive that I've torqued it to spec and that there's no air in the system.
What are your thought?

Last edited by deejumpz9m; 04-09-2017 at 07:17 PM.
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post #2 of 9 Old 04-09-2017, 07:42 PM
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What type of ss lines are they and did you use the washers that came with the kit for the banjo bolt?
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post #3 of 9 Old 04-09-2017, 08:04 PM Thread Starter
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What type of ss lines are they and did you use the washers that came with the kit for the banjo bolt?
They're Core Moto. I did use the washers (copper) supplied, but it leaked the first time. Replaced them with OEM washers (bought a few from the Kawa dealer) for the second time.
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post #4 of 9 Old 04-09-2017, 08:07 PM
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Where is it leaking from? Did you tighten the banjo bolt to spec or just snug it up until " it felt right"?
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post #5 of 9 Old 04-09-2017, 09:34 PM Thread Starter
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Where is it leaking from? Did you tighten the banjo bolt to spec or just snug it up until " it felt right"?
To my knowledge and from what I see after I wipe off the leak. It seems to come from the bottom washer (inbetween) after I've used the brakes a few times. It's a very slow leak, but it's visible even after a short 10-15 minute ride. I'd like some input before I re-bleed a third time, I don't want to waste a set of washers just to see them leak again.
Yes, they're torqued to spec at 18ft-lb (25Nm).
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post #6 of 9 Old 04-09-2017, 10:00 PM
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Well in my mind the only thing it could be is the washer, or more likely, the banjo bolt not seating/threading properly into the plunger. Core Moto comes with a lifetime warranty against leaks but I dont know if this covers it. If it were me I would just order new washers from core temp along with a banjo bolt, bleed and ride and see where that gets me. My advice is to give Core Moto a call and leave out the part about swapping out washers.
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post #7 of 9 Old 04-09-2017, 11:14 PM
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Maybe there is some debris under the washer that didn't get cleaned off the caliper during installation.

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post #8 of 9 Old 04-09-2017, 11:26 PM Thread Starter
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Well in my mind the only thing it could be is the washer, or more likely, the banjo bolt not seating/threading properly into the plunger. Core Moto comes with a lifetime warranty against leaks but I dont know if this covers it. If it were me I would just order new washers from core temp along with a banjo bolt, bleed and ride and see where that gets me. My advice is to give Core Moto a call and leave out the part about swapping out washers.
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Maybe there is some debris under the washer that didn't get cleaned off the caliper during installation.
I'll give them a call for sure. I did the second bleed slowly and systematically, hence why I'm scratching my head about this leak.
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post #9 of 9 Old 04-10-2017, 09:11 AM
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Looking at the photo, it's hard to tell if there is any contact between the core motor line and the one behind it that looks like it goes to the reservoir.... is it touching? That could possibly tilt the end of the core motor line slightly, so you are trying to torque it down when it isn't sitting flush on the washers. Not saying I think that's what is wrong, as I suspect it's a low likelihood. Something to check, before you chuck the line.

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