Do I Need Brake Disc Retaining Screw?

Set screws are put on during manufacture to keep the disc in place on the assembly line. However, once the car rolls off the line, they are completely useless. ... People will say the screw is necessary for the brake disc to stay in place while the vehicle is moving.

Are brake rotor retaining screws necessary?

These screws aren't necessary and only there to keep the rotors on during manufacturing.

What size are brake rotor screws?

The correct size is, m6-1.0 x 14mm.