Originally Posted by ravi@17bhp

1. Check if the disc is bent; take the disc out, put on a flat surface and check for any deformities. If any deformities, change the disc.

2. Are you getting this screeching sound all the time? It is natural to get screetching sound when there is some particles in the disc pads. It goes away after sometime.

Did you change the disc pads even when they are not worn out?