Does anyone know the min thickness.I have a grinding noise from fromt brakes,I just put new semi metallic pads and turned the rotors,I wonder if they are getting to thin.

Almost all rotors made have the specs cast somewhere on the rotor itself. Usually on the outside, but may be on the inside edge. :eek:

I saw some stuff but couldn't make it out..brakes are grinding,think rotors are to thin..have to stand on pedal to get it to stop.booster seems ok