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I am not an expert on brake fluids. I have heard that silicone DOT 5 does not lubricate the rubber/ wheel cylinder wall interface very well, causing wear of the rubber seal. In cars infrequently driven, like most collector cars, this should not be an issue. The non-hygroscopic nature of the fluid is more important. I also have 2 thoughts which could use input: 1. So DOT 5 doesn't mix with 3 or 4. So how is that a problem? 2. For our open vented and unsealed systems, maybe a 1/4 inch layer of DOT 5 floating on top of the regular fluid might slow moisture absorbtion. Dave Homstad 56 Dodge D500 On Sat, Aug 27, 2011 at 4:16 PM, Bob Jasinski wrote: DOT 5 fluid (silicone fluid) )is the only brake fluid that is not hygroscopic (not hydroscopic), like DOT 3 and 4 which are hygroscopic, that is, they attract and retain moisture within the molecular content of the fluid. I too, have poured both in a clear jar and sat it on a shelf for months and saw no interaction between the two. I would not recommend mixing it in a car's brake system though. Its best to do a thorough flush and refill, and even better when the system is being rebuilt with new rubber parts installed. Bob J 1961 300G convert running DOT 5 silicone fluid for 32 years. ************************************************************* To unsubscribe or set your subscription options, please go to
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