My missus was driving slowly in traffic, doing about 25km/h or so, when the left rear wheel locked up. The car wouldnt budge. I drove out to give her a hand (we live just 2 minutes away) and because she was holding up traffic, i locked in its front hubs and moved (forced) it off the road.
Anyway, got a tow home (thanks NRMA) and took it apart to have a look.
The disc had a chunk missing and the caliper cylinder destroyed itself.
The caliper must have seized on one side a long time ago, because the disc was worn very un-evenly. One side of the disc is thick, and the other side very thin. Also, one brake pad is in good condition and the other completly worn.
Guess this will change my attitude of 'if it aint broke, dont fix it'
I'll probably cop some flaming from this, i deserve it, but I could be stopping this from happening to someone else.
Mike
Ps. This happened to a 100 series


