Never mind, thanks for your help anyway
My lorry is old... Almost as old as I am!
But she runs really well except this darn brake problem.
Looks like I will have to start saving up for a new lorry as the French here don't know what they are doing with regards to her and I am loathed to let them touch her as they don't seem to do a lot and then send me a 500E bill for the pleasure!