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Synthetic in any brand will not absorb water.Any thoughts as to brand of Dot 4 Fluid? Bosch ES16-32n might work or do I just go for the sale price item.? Don't care for STP or Castrol or Prestone... Maybe Lucas
Ask DemcoGood point, especially since the Dolly is in Fla most of the year. I have considered Dot 5 (silicone-based brake fluid) but not sure if i want the hassle of purging the Dot 3 or Dot 4 (Glycol Ether/Borate Ester) and expense of Dot 5. From what I have read eliminating the brake system of the residual Glycol Ether/Borate Ester fluid can be quite involved.
Also there is a potential issue with DOT 5 fluid as it might not be compatible with brake components as noted here from an internet technical discussion.
"Additionally, there are some brake systems that may not work with silicone brake fluids because of their chemical composition. It's possible if you have some silicone rubber external components, things like your caliper piston boots, that a DOT5 brake fluid could actually break them down."
While the Dolly brake system is as basic as any, Dot 5 silicone may not be compatible with some of the existing brake components.
Wet and Dry columns are with water and new. I started using dot 5 a long time ago, and yes I am mindful that dot 5 is not for ABS systems. My boat trailer surge brakes worked well with it for one reason it was my only choice. My vintage cars (Before ABS) were converted as soon as I knew there was dot 5.Demco, Dot 3 or 4