The Stovebolt Site Forums The Shop Area Engine Shop Suggested brake fluid

I use DOT3 or DOT4. Dot 4 is more hydroscopic than Dot3 (attracts water easier) but has a higher boiling point. Both Dot3 and dot 4 have a significantly lower boiling point when they are saturated with water, and should be changed annually since the stovebolt system is an open system. A system with a more modern master cylinder with a bellows breather can handle changes every two years. I change my fluid every 3 times I adjust the Hucks. Always change fluid anytime you open the system. I change it by cracking the far bleeder and topping it off as it bleeds down, and then re-bleed all four corners until it runs clear. That gets 99% of the water and crud out.