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Dumb question but can I use dot 3 brake fluid in my 400ex? Ive got plenty of that layin around but the quad says to use only dot 4 and i have no idea what the difference is.
 

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DOT 4 has a higher boiling point than DOT 3. Using DOT 3 probably isn't going to hurt anything, but use at your own risk.

If you plan on doing any racing, I would stick with the DOT 4.
 

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Do not use dot3 use dot 4 or dot 5 the dot 3 attracts more moisture than dot 4 and the dot 5 is a synathic that won't attract moisture i use the dot 5 it also has a higher boiling point than the lower dot fluids.
 

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and just for your information...the dumb question is when you didn't ask !..never a dumb question around here...if you get stumped..ask away..i'm sure we've all been down that road at one point in life..lol.
 
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