LDV Convoy Its a common fault for the rear brakes to stick on,i ran one for 6 yrs,if you keep the brakes well adjusted and clean this should not happen.
You can adjust them manually,using a standard screwdriver through the inspection holes in the brake back plate.no need to take the road wheels off but its best to disconnect the handbrake cables were they connect behind the brake back plate,then adjust then reconnect handbrake cables and adjust them if neccesary
good luck
tom