Valvoline Synpower Brake Fluid. "Exceeds Dot 3 & 4".
11-26-2006, 08:04 PM
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It would depend on how hot your brakes get . . .
Under non-spirited driviing conditions, DOT 3 would likely work just fine, because most conservative drivers never get their brakes over 450*.
Additionally, I think you make a valid point with the rate of decline from dry (i.e., new) to wet (i.e., 1 yr old) brake fluid boiling numbers.
Those astronomically high dry boiling point fluids do tend to absorb water quickly; so, after a year, you do have DOT 3 fluid based on the boiling point.
Many track guys like heavy duty truck fluid, because it tends to be cheap and loses little of its boiling point. However, they tend to run big brake kits (which I have found to run cooler than stock) and tend to change fluid regularly.
I change my brake fluid based on time and color change; when it gets dark, change the fluid regardless of time.
Additionally, I think you make a valid point with the rate of decline from dry (i.e., new) to wet (i.e., 1 yr old) brake fluid boiling numbers.
Those astronomically high dry boiling point fluids do tend to absorb water quickly; so, after a year, you do have DOT 3 fluid based on the boiling point.
Many track guys like heavy duty truck fluid, because it tends to be cheap and loses little of its boiling point. However, they tend to run big brake kits (which I have found to run cooler than stock) and tend to change fluid regularly.
I change my brake fluid based on time and color change; when it gets dark, change the fluid regardless of time.
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