Prestone Brake Fluid now Synthetic Formulation . . . problem?

[srsupertrap]

I have been buying brake fluid for Walmart for decades and for me the choice has been Prestone Dot 4 brake fluid. I noticed the other day Prestone has changed their formulation for both Dot 4 & Dot 3 brake fluid to a "synthetic" formula. Does synthetic mean silicone like Dot 5 or is this synthetic Dot 3/4 formula safe to use with conventional brake fluid I have in the GS & GPz?

If it's a problem what other brand of Dot 4 brake fluid is the GSer community using?

[mrbill5491]

I have been buying brake fluid for Walmart for decades and for me the choice has been Prestone Dot 4 brake fluid. I noticed the other day Prestone has changed their formulation for both Dot 4 & Dot 3 brake fluid to a "synthetic" formula. Does synthetic mean silicone like Dot 5 or is this synthetic Dot 3/4 formula safe to use with conventional brake fluid I have in the GS & GPz?

If it's a problem what other brand of Dot 4 brake fluid is the GSer community using?

The synthetic is fine as long as it says DOT 3/4. I've been using the syn DOT 3/4 for years, no problems what so ever. When you switch, just make sure you bleed (flush) out the system really good to get rid of the old stuff.

Stay away from the DOT 5 unless your system is rated for DOT 5 which I'm pretty sure it isn't.

[bwringer]

Yep, it's strictly not an issue.