Number 5 in our Frequently Asked Questions Series:
WHY DON’T YOU RECOMMEND SILICONE BRAKE FLUID?
Seal compatibility is critical to caliper performance. Very simply put, silicone brake fluid has a very undesirable effect on ethylene propylene rubber found in most brake systems. This tendency to swell the seals, combined with the fact that silicone is compressible when heated or in high altitudes creates unwanted changes to the pedal travel. Seal swelling can also cause brake lockup when used hard. Either of these changes in travel can be so extreme as to cause complete pedal loss or the vehicle dragging to a stop. Therefore, we highly suggest our DOT 5.1 Xtreme 6 fluid, or a comparable DOT 3 or 4 compatible fluid.
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