Bubbling Brake Fluid Batman! - Kawasaki KLR 650 Forum
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post #1 of 13 Old 12-03-2009, 07:09 PM Thread Starter
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Bubbling Brake Fluid Batman!

OK, I recently changed my brake pads which significantly raised the fluid levels. There was some fluid bubbling out of the reservoir up front. Not a lot. Not enough to drip. Just a little bubble and seep. Drained some of the fluid last night. Just went down and pumped the brakes a little and there is the friendly little bubble. Doh. And now that I think about it, I'm pretty sure the brake fluid bubbled out for a few weeks when I first got the bike after I changed the handlebar position. The reservoir and gasket are in good shape, I just looked yesterday. Now I am just confused. My basic strategy now is to wait and hope it stops doing it and keep wiping the thing every once in a while with the finger of my glove, but maybe this has happened to someone before???

Is there something I could seal the crack with...the best idea I could come up with was electrical tape. I'm tired.




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.

Last edited by Lockjaw; 12-03-2009 at 07:12 PM.
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post #2 of 13 Old 12-03-2009, 09:26 PM
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Dan -

The way this thing is supposed to work is that the rubber diaphragm seals the reservoir, while the lid has a hole in it so that the top side of the diaphragm is vented. That allows the fluid to rise and fall in the reservoir without being contaminated by the atmosphere. Brake fluid is anhydrous and will absorb water.

So, now that your reservoir is not overfull, it shouldn't leak, dribble, or make otherwise rude noises. If it is, then the diaphragm is not sealing properly, or perhaps the two screws in the lid are not properly tightened. You say that it bubbled a bit when you first got it; that makes me think that perhaps it was not right form the git-go.

Remove the lid and inspect the diaphragm to insure that it is properly seated and is not damaged. If it looks good, you may want to consider a wee bit of carefully applied RTV sealant to improve the seal. If it is damaged, then replace it.

Tom
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post #3 of 13 Old 12-03-2009, 10:10 PM Thread Starter
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Thanks Tom. I'm hoping it will go away. We'll see, I guess. What is RTV Sealant?




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.
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post #4 of 13 Old 12-03-2009, 10:26 PM
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RTV is "Room Temperature Vulcanizing" sealant. They are often, but I'm not sure if they are always, silicone based. These are sealants that apply as a stiff liquid/gel, then vulcanize to an inert rubbery consistency at room temperature. They have a nasty smell (cyanide?) when curing.

Permatex makes an RTV gasket sealer. I don't think there's anything really special about it, except that it comes with a fine tipped nozzle applicator and it is a very nice blue color.

It's the best stuff to have on hand for applications like the cam cover. Very good in situations where there is a rubber gasket that needs sealing.

For paper gaskets, it's not so good. Permatex makes a very nice, high tack, gooey brown sealant that never hardens and has a very nice sniff factor. Not quite up there with a good MarksAlot, but close...

Tom

Last edited by Tom Schmitz; 12-03-2009 at 10:42 PM.
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post #5 of 13 Old 12-03-2009, 10:55 PM Thread Starter
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MarksALot is tough to beat. Thanks brother.




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.
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post #6 of 13 Old 12-04-2009, 12:25 AM
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Bubbles? Where are the bubbles coming from?
Cause: If the bubbles come from the bottom of the reservoir and appear when the brake lever is barely compressed then you could have air leaking into the system from somewhere. I have seen this on the clutch lever of a VFR and on my KLR after I loosened the upper brake line connection to relocate it.
Cure: Tighten all the connections. Using a handle of a screwdriver bang on the caliper and brake line then lightly compress and release the brake lever until you don't see any air bubbles.

Tim

2005 KLR 685
2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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post #7 of 13 Old 12-04-2009, 10:16 AM Thread Starter
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That's the weird thing. The bubble comes out of the back left (closest to rider) corner where the lid of the reservoir meets the reservoir. If I compress the brakes hard, that's when it happens. I'm gonna take a good ride today though and pump the brakes a lot. Here's hoping...otherwise it is off to the hardware store for sealant (what a shame that would be).




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.
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post #8 of 13 Old 12-04-2009, 09:24 PM
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lower the brake fluid level a bit, should be good after that

Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "holy sh*t, what a ride!"
George Carlin
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post #9 of 13 Old 12-04-2009, 09:28 PM
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I've tried a lot of different RTV's and my favorite is Permatex's "Black Max" RTV.. It's shiny black and has the best temp rating of all that I've seen or used... And of course, it's the most expensive, but you're getting what you pay for with this one..

I think my work tool box has 6 tubes in it.. It's good stuff!!
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post #10 of 13 Old 12-04-2009, 09:40 PM
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I don't understand the use of RTV for a leaky master cylinder. The lid should seal properly. If not, get another seal.

Tim

2005 KLR 685
2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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