Brake Fluid Question - Kawasaki ZX-10R.net
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post #1 of 20 Old 08-09-2007, 06:40 PM Thread Starter
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Question Brake Fluid Question

We have a discussion going on in our local bike forum as to weather or not sunlight breaks down brake fluid and the real reason why people/race teams use a resevoir cover.....It there any truth to the statement that sunlight breaks down brake fluid????

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post #2 of 20 Old 08-09-2007, 09:44 PM
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i have heard the uv light will but never saw proof, but i do know that if you somehow hurt the master the wristband will stop it from splattering everywhere.

i did a google and found that dot 3,4,5.1 will degrade by sunlight

2004 ZX10R, mostly kinda stock
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post #3 of 20 Old 08-10-2007, 12:00 AM
 
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I'm wondering how much 'sunlight' gets through that tupperware bowl on my bike anyways.......
You figure sunblock lotion comes in SPF 50, what SPF do you think a 1mm thick sheet of plastic is?
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post #4 of 20 Old 08-10-2007, 07:13 AM
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I heard the samething to. Hear in Az. we have a whole lot of sunny days.

Rain. Whats is this Rain i keep hearing?.
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post #5 of 20 Old 08-10-2007, 07:18 AM
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That cover is just to trap seepage of brake fluid in the unlikely event it does happen. never heard of sunlight effecting brake oil in a plastic cup.
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post #6 of 20 Old 08-10-2007, 07:33 AM
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There are 2 main types of brake fluids. Glycol and silicone. Glycol fluids do degrade from sunlight. You usually don't see silicone fluid in bikes...I think it has something to do with a spongy lever feel but I can't say for sure.
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post #7 of 20 Old 08-10-2007, 11:19 AM
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the #1 killer of brake fluid is moisture due to being hydroscopic, hence it absorbs water from the atmosphere and as it does the boiling level is slowly reduced so all the talk about changing & bleeding fluid IS important.

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post #8 of 20 Old 08-10-2007, 11:22 AM
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Quote:
Originally Posted by Big Daddy View Post
the #1 killer of brake fluid is moisture due to being hydroscopic, hence it absorbs water from the atmosphere and as it does the boiling level is slowly reduced so all the talk about changing & bleeding fluid IS important.

BD
Trust me I changed my fluid out every other race w/e and it needed it. I have seen a fellow racer not change his for a while and then his brakes totally go out on him and he had to quit the race after nearly crashing running straight off a corner. We helped him change it and it was brown and nasty. So while bleeding is a good idea always a complete flush is a good way to keep the fluid fresh.
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post #9 of 20 Old 08-10-2007, 11:55 AM
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Shit and now this. Where my new bottle of brake fluid...
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post #10 of 20 Old 08-10-2007, 02:28 PM
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Quote:
Originally Posted by bkkninja View Post
Shit and now this. Where my new bottle of brake fluid...
Once you crack the seal the process begins so ensuring its resealed tight, stored in a cool dry area is imortant as well.

BD




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