Thank you Degsy, excellent advice. We all have a duty to maintain braking systems in perfect working order for the very reason you allude to in your final sentence. I'm sorry if it seemed as though I was suggesting otherwise as that was not my intention. If you look back over my posts I am appealing for information rather than making a recommendation.
Really, we are voyaging into an interesting area here. I mean, what is a "restoration" ? I'm sure we can all think of vehicles on the rally circuit that were cruddy old lorries that stood for years and then were given a paint pot restoration and may now look resplendent in new paint with all the correct markings but beneath the paint is that same cruddy, and potentially dangerous, lorry.