I have questions regarding bleeding brakes that use DOT 4 and 5.1 fluid, typically with a syringe style bleed kit:
Why does DOT 4 and 5.1 have a shelf life of 1-2 years? If it's only because it absorbs moisture, what should I expect if I decide to "de-gas" old unused DOT fluid through the vacuum method before adding it to a brake system (ex. Avid/SRAM)? Has to be better than what's currently in the brake, right?
If I create a vacuum with the syringe attached, is it like vacuum bleeding in a way (ex. susp vac bleeding)? xD I hear people say it's useless, and it's just air passing by the seals, but more "sciency" guys say boiling points lower in a vacuum and the moisture in the DOT fluid is changing to a gas.
Why does DOT 4 and 5.1 have a shelf life of 1-2 years? If it's only because it absorbs moisture, what should I expect if I decide to "de-gas" old unused DOT fluid through the vacuum method before adding it to a brake system (ex. Avid/SRAM)? Has to be better than what's currently in the brake, right?
If I create a vacuum with the syringe attached, is it like vacuum bleeding in a way (ex. susp vac bleeding)? xD I hear people say it's useless, and it's just air passing by the seals, but more "sciency" guys say boiling points lower in a vacuum and the moisture in the DOT fluid is changing to a gas.