Broken brake fluid window - Wrist Twisters
 
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post #1 of 19 Old 10-10-2014, 10:18 AM Thread Starter
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Broken brake fluid window

So yesterday I got a call from a friend saying that she was stranded; the bike wouldn't start and was leaking fluids. Fearing a blown gasket and a seized engine I raced over... to find that it was a dead battery and a broken brake fluid window.

Anyways, the bike is an '06 gx250, and the part that broke was the little window in the brake fluid reservoir on the handlebars. Does anybody have an idea for a patch that would hold up until I'm able to put a new master cylinder assembly on for her? Is there any type of putty (JB weld type stuff) that is brake fluid resistant?

EDIT: If anybody knows of a way to replace just the window that would be great too; I dind't mention it since bikebandit's diagram shows it being a single unit.

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post #2 of 19 Old 10-10-2014, 11:15 AM
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A dime (or other coin) and some epoxy?

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post #3 of 19 Old 10-10-2014, 11:55 AM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
A dime (or other coin) and some epoxy?
Hmm, that seems like it'd work. A quick googling has come up with numerous instances of many kinds of epoxy deteriorating in brake fluid, including a few iffy reports on JB. I need to find something that'll last for a while since the friend currently doesn't have the cash to replace the master (broke grad students here). Does anybody have any first-hand experience with epoxy and brake fluid?

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post #4 of 19 Old 10-10-2014, 12:17 PM
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We are going to need some pictures of your friend to enable us to help you better.

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post #5 of 19 Old 10-10-2014, 12:24 PM
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Quote:
Originally Posted by marylandmike View Post
We are going to need some pictures of your friend to enable us to help you better.

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post #6 of 19 Old 10-10-2014, 01:34 PM
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While JB Weld may react to brake fluid in the long run, it will serve as a temporary patch adhesive until a replacement master cylinder is installed.

On the other hand Marine Tex epoxy has served me quite well when patching fuel tanks, and I once built a "temporary" rear master cylinder from several pieces bonded together with it, and instead of having to make another from billet it proved to work so well it is still in service some 10 years later.

Impertinent question: how the hell did it get broken?!

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post #7 of 19 Old 10-10-2014, 01:36 PM Thread Starter
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Quote:
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We are going to need some pictures of your friend to enable us to help you better.
Jeeze, leave it to internet lechers to jump at the mention of a college girl.

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post #8 of 19 Old 10-10-2014, 01:43 PM Thread Starter
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Quote:
Originally Posted by robtharalson View Post
On the other hand Marine Tex epoxy has served me quite well when patching fuel tanks, and I once built a "temporary" rear master cylinder from several pieces bonded together with it, and instead of having to make another from billet it proved to work so well it is still in service some 10 years later.

Impertinent question: how the hell did it get broken?!

Rob
Looks like I'll be huntin down some marine tex.
As for how it broke... I've got nothin. It's obvously rotten through, but it was still somehow punched inwards. She says that she has no idea either, so either someone else messed with it, or she accidentally stabbed it when she was freaking out about it not starting.

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post #9 of 19 Old 10-10-2014, 03:17 PM
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Jeeze, leave it to internet lechers to jump at the mention of a college girl.
Oh its a college girl! You're gonna need a jeep and some ice cubes.

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post #10 of 19 Old 10-10-2014, 04:35 PM Thread Starter
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Quote:
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Oh its a college girl! You're gonna need a jeep and some ice cubes.
Well, vet student. Not a "like, OMG" sorority girl (aka the jeep type).


Anyways, upon cross-examination, she admitted that she didn't know what the window was... so she pushed on it.

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post #11 of 19 Old 10-10-2014, 05:21 PM
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Well, vet student. Not a "like, OMG" sorority girl (aka the jeep type).


Anyways, upon cross-examination, she admitted that she didn't know what the window was... so she pushed on it.
A vet student that rides is much better than any old sorority chick. Hope you can help her get her bike back on the road.

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post #12 of 19 Old 10-10-2014, 06:58 PM
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The guys on the Nighthawk forum use a watch crystal to replace the sight glass on a master cylinder. Might look into that.

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post #13 of 19 Old 10-11-2014, 05:26 PM
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Quote:
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The guys on the Nighthawk forum use a watch crystal to replace the sight glass on a master cylinder. Might look into that.
Ah, that's a good idea. A cheap woman's watch is probably about the right size, too.

Back to the epoxy question, I remembered buying some epoxy that was for Marine use; it could be mixed and would harden under water, and was water insoluble.

Since brake fluid is water soluble as well, I bet that Marine grade epoxy would work.

And it set up REALLY hard, I used it to fix a cap on a water jug.

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post #14 of 19 Old 10-11-2014, 05:33 PM
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Ah, that's a good idea. A cheap woman's watch is probably about the right size, too.
What brand of watch does a cheap woman wear? I asked my wife but she said she just uses her phone.

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post #15 of 19 Old 10-11-2014, 06:32 PM
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Here's a link to a thread discussing it: Login

Sounds like Esslinger.com and regular old RTV get the job done.

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post #16 of 19 Old 10-11-2014, 07:27 PM
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What brand of watch does a cheap woman wear? I asked my wife but she said she just uses her phone.
You know, I 'just' about googled Cheap Woman images, but thought better...

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post #17 of 19 Old 10-11-2014, 07:43 PM
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You know, I 'just' about googled Cheap Woman images, but thought better...
It will be fine as long as your safe search filter is on

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post #18 of 19 Old 10-11-2014, 08:29 PM Thread Starter
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Quote:
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Here's a link to a thread discussing it: Login

Sounds like Esslinger.com and regular old RTV get the job done.
Thanks! I'd seen the watch glass idea a couple different places, but I couldn't find any mention of where it was sourced from. Sadly the link you posted doesn't work for me since I don't have a nighthawk forum login.

Quote:
Originally Posted by g00gl3it View Post
You know, I 'just' about googled Cheap Woman images, but thought better...
Do it and let us know what you find. On second thought, I'm not sure I'd want to know...

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post #19 of 19 Old 10-11-2014, 11:10 PM
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Measure in MM the window size, call a watch repair shop and tell them you'd like a mineral crystal replacement for that size. Don't get up-sold for a sapphire lol. Seiko Hardlex should be available in the smaller sizes.

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