[NightRydaSS]

Originally Posted by WildBillyT

If your brake fluid is black you will get a noticible improvement in your braking performance. Once the fluid boils or gets dirty it does not retain its normal behavior during operation.

DOT3 and DOT4 are compatible. I would replace it with what the vehicle calls for- I use Prestone Synthetic DOT3. I don't know why a rotor manufacturer would have any say in what fluid you use.

DOT5 is silicon-based and it is not compatible with DOT3 or DOT4.

how would i get improvements if i change it (i am changing it, im just really curious). i could see this being true with oil b/c of how the engine uses it (all the heat, and the fact that it is being "grinded" away in the motor). I never thought brake fluid "went bad" like engine oil does from use. i always though of it like anti-freeze (where u might flush it once every 60K miles just b/c).

i think b/c these are a street/weekend strip (auto-x) rotor, they recomend the DOT4 for "abuse use", but im almost usre my cars has/normally uses DOT3.