Front disc squealing, after trying everything I could think of (cleaned pads, cleaned rotors, new pads, clean and sand rotors) I discovered that gently squeezing the rotor with a rag and dragging it along produces the same squealing noise (see video). Any ideas on how to address this?

Front disc squealing, after trying everything I could think of (cleaned pads, cleaned rotors, new pads, clean and sand rotors) I discovered that gently squeezing the rotor with a rag and dragging it along produces the same squealing noise (see video). Any ideas on how to address this?

Front disc squealing, after trying everything I could think of (cleaned pads, cleaned rotors, new pads, clean and sand rotors) I discovered that gently squeezing the rotor with a rag and dragging it along produces the same squealing noise (see video). Any ideas on how to address this?
byu/rhyzomatic inbikewrench

by rhyzomatic