Thanks for help, we've had someone else look at the lorry and he thinks it might be a valve near the back axle, (not sure what its called), he says it appears to be leaking I,e, air bubble appear, plus a couple of leaky joints, were going to replace the valve (about £20 for the part) and fix the leaky joints. I'll keep this updated as it may help others with similar problem, if you can identify the value that may help, all I know is it is near the back axle and might be something to do the handbrake. thanks
Peter Bolton
October 2014