03-02-2020, 10:34 AM
Further to Jim's comment above, silicone fluid differs from conventional ethylene glycol based fluids in that it is not hygroscopic. At first sight this might appear to be an advantage, however if any water does get into the system, rather than being 'absorbed' into the fluid where corrosion inhibitors can do their stuff, it forms separate globules in the brake lines which may cause localised corrosion spots (not to mention vapour locks, should you succeed in generating enough heat). Either way inspection of your wheel cylinder pistons sounds like a good idea.