Brake rotors are typically made of , which is highly susceptible to flash rust when exposed to moisture from rain or high humidity.
: The initial layer of rust acts like fine-grit sandpaper, which can cause a loud squeal or grinding noise until the pads scrape the surface clean. Rotor - Rotos 2.1 (Rainy Day)
: A thin orange or brown layer of iron oxide can form on the rotor's surface within just a few hours of being parked in the rain. Brake rotors are typically made of , which