bigdad is right.
However, Volvaline SynPower Brake Fluid's wet boiling point doesn't make it pass then DOT 5.1 standard.
DOT 5.1 is better than DOT3 and DOT4 in all aspects except:
1. Price: Cuz not many ppl use them. Also, they are synthetic so they are more expensive.
2. Not compatible with mineral based DOT3 and DOT4 fluids. But, why would you want to add DOT3/DOT4 fluid just to tap off the resevoir?
3. Easier to absorb moisture. However, even when they are really wet, they still have a higher boiling point than dry DOT3. Besides, it's better to change your resevoir seal and brake line while you are at it, so you shouldn't have to worry too much about moisture. If you are really worried about it, use ATE fluid. Most professionals recommand ATE for high performance street vehicles. I believe BMW OE fluid is also made by ATE.
(I got Motul 5.1 b/c my local shop was giving them away at only $7 a bottle
here's a link for comparason http://www.swedishbricks.net/700900FAQ/Brake Fluid Comparison.htm
SpeedDemon, I got Motul 5.1 when I changed to SS brakelines, so I don't know if just changing the fluid would help to achieve a stiffer pedal. What I've noticed is that my ABS now works much more often/aggressive after I changed all brake/ABS fluids to 5.1
I need Tires with more grip than my current set now