This rotor was allowed to wear completely through the inner surface, exposing the vent fins. The driver didn't notice until the caliper piston had hyperextended enough to leak fluid, resulting in NO pedal feel.
No, it's not on a Bronco. IIRC, it was an Escort, and yes, it was a girl driving.
Before buying craptasmic brakes or other common parts, check for
coupons & service offers from Ford.