I've seen Brembo 345x32 Drilled rotor rings crack, I've seen stoptech rotor blanks crack, I've seen racing brake rings crack. All rotors will get subsurface cracks and indications eventually.

Drilled rotors just have more places for these cracks to form.

My Build thread: Let the hemi swap begin!

1968 wanna be pro touring whatchamacallit with some fancy stuff and a new roof skin.