i think it's a bad idea.
even if WD40 offers only the barest minimum of so-called 'lubrication', it may still be enough to make you lose braking power, resulting to bumper damage.
if the opposite happens naman, that is, the brake rotor surface becomes 'grabby', it'd be an uncomfortable drive until the layer strips off.
kinakalawang yung disc brake rotor?
i wouldn't worry about it.
the amount of rust formed is so minimal, it will take many years and many tens of thousands of kilometers, for them to become replacingly thin.
and it's so easy to clean them! the thin layer of rust is completely removed after two or three mild applications of the brake pedal.



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