Brake Pistons seizing through salt corrosion is so common if you ride a bike through the average British winter. I've no idea whether things have improved over the years (my current winter bike used drum brakes) but with Jap stuff there used to be a brake seizing pecking order with Yamaha at the bottom. You'd think a good wash would get rid of the salt but where it collects in the gap between the piston and calliper and behind the pads is hard to get clean water into. Plus it's warm in there - just perfect for corrosion.
The only real way to avoid it is for the manufacturers to put rubber bellows over the pistons - that's what cars do. There may be some bikes with brakes like that but I'm not aware of any and I've never owned a bike with them. Failing that it's going to be a regular strip down and clean - particularly if you've got pistons that already have some salt damage.
ACF50 is good and if you applied it carefully it might work for a while but it won't be an apply once and leave until spring regime like it is on other parts of the bike. It does wash off if it's in direct road spray and it certainly burns off if it gets hot. Ifyou're a bit slapdash applying it you won't have any brakes at all next time out until you burn it off the disc.
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