Can you mix Break Fluid Dot 3 & Dot 4?

Pigeon

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2005-01-03
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My car need to top up the break fluid but I am not sure the previous owner use Dot 3 or Dot 4 break fluid.

Any body know what happen if the sytem have Dot 4 now but I add Dot 3 break fluid to the break system?

It is 92 Honda Civic Si

Thanks
 
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