How do you fix the ringing noises your disc brakes are making?

Answer 1

Check aligment of brake caliper

Check trueness of rotor

Clean any gunk off rotor brake surface

Try another set of pads, there are different compounds available

Make sure to bed new pads in properly

Try another brand of rotor, preferably a heavier one

Some brands/models are just prone to noise, particularly when wet. Not always anything (apart from switching them out) that can be done about it.