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Old 06-06-2013, 05:02 PM   #1
the cavalier OP
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rear brake reservoir leak from sight glass

HI.

My rear brake [a brembo, on a 2006 950 adventure] is leaking from the reservoir. I thought it was the master cylinder, but after replacing that,... it still leaked.

While I was inspecting the reservoir to find the leak the Sight Glass popped out!
I pressed it back in good and strong with just my hands, and now the leak has stopped. at least while it is on my work station ...However this is not a fix I trust.

Should I epoxy the sight glass back in? It has an o-ring in good condition. Where would I epoxy it from? the inside edge has the o-ring. Just on the planes that touch right? there is a recessed slot the sight glass fits into.

Will the epoxy get into my brake fluid. should i use something better? Permatex RTV?

Do I need to break open the piggy bank and buy a replacement reservoir?

Has this ever happened before? My searches came up blank on adv. there was mention of it on a honda rebel forum. It suggested using an epoxy.

Seems like a quality issue with brembo to me. Nothing traumatic happened to the reservoir. [Besides a humid heat wave]

Is it time for an upgrade? to what?

I appreciate the thoughts.
Thanks,
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Old 06-06-2013, 05:47 PM   #2
BigNastybrp
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I have seen a dime and jb weld so why not some jb weld on the out side to hold the glass in? Bert
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Old 06-06-2013, 09:53 PM   #3
gefr
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I had this problem.

My sight glass was lost on the trail. I asked a workshop to built a sight glass for me. However after a month, master cyl started leaking. It seems some dust got in there, scratching the surfaces. I believe you can try jbwelding your sight glass and see how it holds. At the place it seats there no big inside pressure, so it may hold.
Cheers.
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Old 06-07-2013, 04:08 AM   #4
Kobus Kruger
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I had same problem (2007 990). Mine came slightly loose but luckily did not fall off. Biggest problem is if you loose the glass.

This is not commen but can happen after a few years.

I simply pressed mine in and used normal cheap contact glue to keep the glass in place on the outside. Now all is good for more than 2 years now.
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Old 06-07-2013, 05:37 AM   #5
Roeligan
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Quote:
Originally Posted by Kobus Kruger View Post
I had same problem (2007 990). Mine came slightly loose but luckily did not fall off. Biggest problem is if you loose the glass.

This is not commen but can happen after a few years.

I simply pressed mine in and used normal cheap contact glue to keep the glass in place on the outside. Now all is good for more than 2 years now.
Hmmm... I've noticed mine was loose too... Gonna try to fix it with the glue...
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Old 06-23-2013, 11:57 AM   #6
the cavalier OP
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fixed!

Hi all!

Just want to follow up on this post...

JB weld on the sight glass worked great! my rear brake works now!
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Old 06-23-2013, 01:39 PM   #7
KTMSER
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Quote:
Originally Posted by the cavalier View Post

Seems like a quality issue with brembo to me.

Nothing traumatic happened to the reservoir. [Besides a humid heat wave]

,
Not a quality control issue, rather a lack of maintenance.....

Everyone over looks the brake fluid.. Brake fluid absorbs moisture!

Then the rear brake builds heat and try's to boil off the moisture which in turn creates pressure and push's the sight glass out...

You answered your own question about the fault in the second sentence above... (
Humid heat wave)

The front brakes on these bikes do not seem to be as sensitive as the rear to this condition.. Plus most are not heating the front up as much as the rear..

I bleed the rear with fresh fluid every other oil change.. The front about every six months...

I experienced one rear brake fade and failure do to old fluid and with a little maintenance have never had another ..
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Old 01-21-2014, 02:44 AM   #8
macleod
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I have the same issue. Bought some selastic and brake fluid. I'm planning to drain the old fluid, take the glass out, clean it and put it back. Hope this works.

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Old 02-07-2014, 11:12 PM   #9
what car??
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"'Not a quality control issue, rather a lack of maintenance.....'" And finger back at ya pal!!! What intelligence to post a moniker like that!!!! WOW

Personally I think you're full of shit!!!!! I don't feel that it's an issue with maintenance. I have had my bike for 35K+ and am leaking. I have replaced my fluid regularly and am figuring out how to keep the leak at bay. I replaced the piston assembly with OEM KTM parts and still leaks. Yes, I AM very mechanically versed!!! 12+ years as an auto tech with moto's also involved. My leaks are not from the window, but from the seals and coming out the bottom where the pedal shaft goes into the cylinder. Personally I feel it's a KTM flaw.... I love my Katoom!!!! Wouldn't trade it for anything, but let's face it, there are inherent Achilles heels in any vehicle/bike.... I think this in one of them. It absolutely disgusts me to think think that I have to replace the rear brake master with only 35+ miles on it!!!!!! I am trying to figure out a way to avoid having to replace it...... Experimenting as we speak and will post up, hopefully to avoid having others to pay for a NON FUNCTIONING REAR MAIN PISTON REPLACEMENT ONLY TO HAVE IT GO SOUTH ON THEM WITHIN A FEW K...

If there are others that have similar situations that have longevity with only replacing the piston get in touch!! Would love to hear from you and your ideas and tribulations....

Cheers, viva la KTM
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Old 02-08-2014, 03:10 PM   #10
gefr
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Hi there,

I had to replace my rear brake master cyl at about 40k kms. I hoped for resleeving but couldn't find the way to check if there are little holes feeding the mc from the reservoir. If anybody finds a way, would happily try resleeving.
Cheers.
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Old 02-10-2014, 01:19 PM   #11
macleod
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Finally decided to give it a try last night at fixing this PIA problem. I've cut the zip ties and removed all the brake fluid from the reservoir. But surprise, I could not get the glass out. So I took the sealant and started to push it inside with a cutter blade. I have clamp it after that and I'll leave it as it is for a day. If it's not gonna work I'll put some epoxy. If still not working I'll get the a new master cylinder.

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Old 02-15-2014, 05:43 PM   #12
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After 5 days the fix is holding fine. It is a little messy but I don't care as long as it's working. Next week I have a longer trip from Sydney to Melbourne and back. We'll see how it holds up to the punishment I'll put her through. I'll post more info in about 2 weeks.

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Old 05-19-2014, 09:01 PM   #13
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Update

Still holding. Happy with this fix. I`ll still replace the complete pump when I`ll ditch the ABS - later on this year.
Quote:
Originally Posted by macleod View Post
After 5 days the fix is holding fine. It is a little messy but I don't care as long as it's working. Next week I have a longer trip from Sydney to Melbourne and back. We'll see how it holds up to the punishment I'll put her through. I'll post more info in about 2 weeks.

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Old 05-20-2014, 04:16 AM   #14
ADVill
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Raced dirt bikes for decades. Never heard of sight glass ever coming loose. Definitely not a maintenance issue. There's nothing to maintain.
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