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Well I looked at my $300 brake fluid refractometer today, it is calibrated for dot4 and dot4+, the scales are set up in percentage of moisture vs boiling point.
dot4 dot4+
1% 240C 275C
2% 195C 240C
3% 175C 195C
4% 160C 183C
5% 152C 167C
6% 140C 160C
These numbers are close, the scales have big jumps so I just guessed as best I could. At 2% the difference is 45C, 2% moisture content is also the max recommended.
I'm not sure about other sources for the dot4+ besides Volvo, I just go to the aparts window and thats what we carry now.
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