I've got 3 'older' cars which I purged, cleaned, changed all the rubber parts, and changed over to Dot5/Silicone fluid, the oldest 25 yrs ago (a '69 Corvette). The other cars are a '60 Corvette, and a '57 Bel Air. No brake problems since with any of them, even though they sit most of the time. I've recently gone thru the Camaro's brakes the same way, and installed silicone fluid in it, although it has not been driven as yet. For someone who has many cars, which sit more than they are driven, I strongly recommend silicone fluid to reduce costs and effort in keeping your cars maintained. If I only had a single car, which I drove often, then perhaps I'd make a different choice, but I'm not sure.