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Old 05-03-2002, 11:40 AM   #1
Scooby Specialist
Member#: 16215
Join Date: Mar 2002
Location: In a place with no laws, just "guidlines"
2002 WR WRX wagon

Exclamation Brake Fluid and Cold Temps.

Kinematic viscosities: All brake fluids (DOT 3, DOT 4 and DOT 5) must meet a minimum viscosity test of not less than 1.5 centestokes at 100 C (212 F) and must not be more than the following to meet their various classifications (the larger numbers indicate higher kinematic viscosities just like with motor oils).

DOT 3 1500 Centestokes at minus 40 C
DOT 4 1800 Centestokes at minus 40 C
DOT 5 900 Centestokes at minus 40 C

*-40 C = -40 F*

Higher kinematic viscosities means it "flows easier" at the cold temps.

A centestoke is is 1 mm^2/s

English: The higher the number the more likely it is to turn to goo at low temps. It is a linear relation. So at those cold temps it takes 16% more pressure to flow the same amount of DOT4 as DOT3. This MAY cause an issue with ABS.

By the way, KV does not change in a linear way as temps fall. Up to about 0 F DOT3 and DOT4 are close, but below that DOT4 starts to become more viscous.
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Last edited by romanom; 05-03-2002 at 01:48 PM.
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