brake fluid-what and why?

[zed]

Originally Posted by ZUKIMON

I'm still unsure about my fluid. My 929 says DOT 4 on the caps, and I have a quart of DOT 4 Castrol Synthetic sitting here on my workbench at work. Is there a DOT 4 that's not synthetic? Will this be OK in my bike? I've never messed with anything other than DOT 3.

without looking it up somewhere I don't know the answer, did you look on the container and see if it says not to mix with other DOT4 fluids?

[ZUKIMON]

I'll quote it when I get back to work tomorrow, but it never stated that it either could not mix, or could mix with DOT 3/4 fluid. ??? That's what threw me....

I mean, my cap says DOT 4, and this fluid is DOT 4 Synthetic. How do I know if mine is synthetic or not and if they will combine if mine isn't. I'm at a loss on this one. Can you even get DOT 4 that's not synthetic?

[ZUKIMON]

Here's what I have.

http://www.amazon.com/Castrol-Synthe.../dp/B0002JMAKW

If you read the specs, that's exactly what it says on the bottle. Not one word mentioned about mixing or changing/flushing out the DOT 3 or non-synthetic DOT 4.

[101lifts2]

Motul 5.1...the suspension guy told me to run it. Didn't notice any difference.