Confirm applicability - fluids you use and temps you fly
Following edited info pulled from data at first site identified,.... looking at it,... you would not want to use Viton if getting your brake fluid from Local auto parts place... or if you do really cold weather flying (including at altitude)
Under dynamic conditions, the lowest service temperature is between 5?F and 0?F.
Not Compatible With:
Glycol based brake fluids
Brake Fluid
Chemical Resistance:
Mineral oil and grease, low swelling in ASTM oil No. 1, and IRM 902 and IRM 903 oils
Hydraulic Oil, Petroleum Base
Non-flammable hydraulic fuels in the group HFD
Silicone oil and grease
Mineral and vegetable oil
Very good ozone, weather and aging resistance.