bubble in brake fluid view glass - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 6 Old 05-29-2009, 03:41 PM Thread Starter
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bubble in brake fluid view glass

Hi,

So I've replace and bled fluid in the past on a different bike. I've done it one time and I knew to do it because the fluid looked dirty. I just got an 06 strom and was going over it to see what needs to be done. When riding I noticed that I could see a bubble in the view glass of the front brake cylinder. When squeezing the brakes (which seem to be working fine) I noticed the bubble first got smaller... then disappeared. When letting go it did not immediately come back but eventually it did. Just wanted to get a confirmation that that's an air bubble that's traveling through my line and needs to be bled. Thanks.
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post #2 of 6 Old 05-29-2009, 03:58 PM
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The sight glass is above the brake line. Any bubble is just from fluid in the reservoir being jounced around which can also cause it to break/divide/change in size or number/disappear. It's normal, not in the brake line and does not indicate a need to bleed.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
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post #3 of 6 Old 05-29-2009, 04:18 PM Thread Starter
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good to know. thanks. also, in the manual it says not to use any old, used or unsealed brake fluid. does that mean that every time i replace fluid i have to buy a new bottle or is it okay to use the fluid from a previously used bottle that was closed after previous use about 9 months ago.
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post #4 of 6 Old 05-29-2009, 04:31 PM
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I would buy a new bottle.

Quote:
Originally Posted by mshest View Post
good to know. thanks. also, in the manual it says not to use any old, used or unsealed brake fluid. does that mean that every time i replace fluid i have to buy a new bottle or is it okay to use the fluid from a previously used bottle that was closed after previous use about 9 months ago.
Everything says that it picks up moisture from the air as soon as you open it.

I would buy a new bottle. However I did buy a big bottle and changed the three bikes in my garage as well as two others, within a few week (maybe a month) period. I'm not sure I would have used 9month old fluid though???

Oh ya. Just to second it, I would say that a bubble in the viewfinder means that you're properly using your Strom. That is you've taken it on something other than smooth pavement, and hopefully gotten it dirty!

DL650K6, MadStad adj shield, Givi e45 & e36, gpsmap 76CSx, Pat Walsh skid plate & bars, Sargent seat
2004 DRZ400S
[URL="http://www.sr.unh.edu/~rea/stromtrooper/2007/Strom_Range.png"]My 2007 Range map[/URL]

Last edited by RedAnt; 05-29-2009 at 04:32 PM. Reason: added bubble ok
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post #5 of 6 Old 05-29-2009, 04:35 PM
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Dot 3 and 4 brake fluids are hydroscopic.

These fluids absorb moisture that gets into the brake system.

Problem is that they will suck moisture out of the air.

So an opened container is somewhat contaminated.

I would not worry too much if you change your brake fluid regularly.

It realtively cheap and easy to flush the system.

On both my Suzukis there is something in the sightglass.
I think it is there to help you see the level as it floats to the top.
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post #6 of 6 Old 05-29-2009, 11:55 PM
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Bubble is normal. When there is no bubble, the resevoir is empty.

I've always wondered why brake fluid manufacturers don't invent some new sort of container with a floating lid that keeps the air away from the contents. Or just package it in a squeeze tube or something. Seems a waste to discard perfectly good brake fluid.

Personally, I just buy the smallest amount possible and use it up as quick as I can. So I've got a little moisture in my brake fluid. Big deal.

DL1000K6 Two wheels good; four wheels bad.
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