On Fri, 9 Aug 2013 17:32:29 +0000 (UTC), Adrian
wrote:

Until I tried to remove the wheel. It wouldn't come out the arch easily.
Suspension on high, and wangle it out. Some numpty had unbolted the hub
nut, and levered the brake disc out, bending the caliper's bracket so the
caliper was 45deg to the arm. Then they'd unbolted the disc from the hub,
put the hub and wheel back on and flogged the car.

It only had one rear disc. That was why that brake was ineffective...

Lol!