Series 2 Brake fluid ?

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Agreed, just wasted a lot of time on this and the answer is DOT4. Same chemistry as DOT3 but higher boiling point. Do not go to numbers such as DOT 4.1 or 5, they are very different. DOT 3 ok but not common, DOT 4 best.
 
If yours is a completely new system which has not had dot4 in you could go synthetic which i think is dot5
 
I would not use DOT 5. it is more compressible and gives a spongy pedal, most DOT 4 is now synthetic and its easy to get. DOT 5 is silicone and can't be mixed so you are stuck with it. DOT 4 can be mixed with DOT 3 (it just behaves like DOT 3 then).
 
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