well the originals have lasted since new in '93 but it appears its time for new, found this major crack in the l.f. rotor when putting on my new lockout hubs. going to drill holes in the new ones to fasten the hubs to the rotors with screws. i was wondering why i was getting a pulsating pedal under heavy braking, guess i know now. ive not seen one do this before. its a little hard to see in the photo, crack is at about the 11 o'clock postion. at least new ones werent too bad, about $30 per rotor. napa had some high-performance rotors for $130 a piece, looked like racing rotors with the grooves and cooling holes. if the truck were newer i might have considered it, but im not convinced it would be much of a upgrade for the $ id be spending. now for warmer weather so i can do the job. im also going to take the spindles off and inspect the spindle bearings and axleshaft U-joints. but not at 30 degrees. heres a pic:

 

Seen it on a lot of ttb trucks, not much else though. Good thing new is cheap.