i thought mine said use either 3 or 5 fluid. i always put in 3! looking online it does say 5 is silicone based and does not mix. so if this is correct and my bike does say that then you would have to completely drain the 3 and use 5. bike is away at my pops awaiting my stator rebuild or i would go check for sure
You're right sebastian. Here's how Brembo explains the MC reservoir marking in their Technical Notes:
Yes, we know the cap on the rectangular master cylinders says “DOT 3—5 Fluids”-BUT PLEASE NOTE: Silicone DOT 5 fluids are NOT generally in use in Europe, but Glycol-based “DOT 5.1” fluids ARE. Hence, the “DOT 5” cap designation.
Allow me to chime in on this. We have had this debatew going on in the antique and collector car world for some time.
I would recommend DOT 5 silicone only on vehicles that spend "most" of their life in static display. Its resistance to moisture wicking is almost nil. Even then i would only use it after a thorough flushing 3-4 run complete system bleedings. Personally if cost permits i replace all the components of the system.
Ive used DOT 5 silicone for years on opne of my cars that sits for most of its life and hits the race track 3-4 times a year with no events.