After having lots of trouble with maguras and vee's i wanted to try something new.
So i went for a rear disc, i went to the local bike shop and picked up a shimano deore 2012.
Its the best brake i have ever used, i have landed skips, pallets, cars, cable drums and tractor tyres on my rear wheel and the brake hasn't slipped once, if anyone wants a new brake this is the one to get !
Ps: If your wondering what i was doing riding on cars i was at the local trials show and was able to practice on there before it started and after it finished.