We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Jo
saying something like:

http://img197.imageshack.us/img197/8355/brakediscs.jpg

Are these brakes worn and were his charges reasonable? I estimate the
thickness of the abrasive portion of the parts to be 5mm thick.

Sorry for my ignorance on the subject, I'm a medical student!

Depends purely on your style and pattern of driving, but I'd say there's
anything from 5K to 20K miles left in those.