Do not do this!

[flyerncle]

They used to do it with new Nissan models Andy.

Ronnie I know what you mean,the only ticket I would have issued that plastic pig would have been a PG9.
Unfortunate thing with testing is the human element,insted of reading the manual people interpret it in their own way,I have been "at it" more years than I care to remember and have never had any problems with VOSA/Ministry.
Brake pipes are the bain of any tester and I have seen them failed for light rust,I may be wrong and have been many times,rust is the start/cause of corrosion and on the many occasions I have attended courses/refresher training they have always said if it is pitted fail it if you are not sure advise.
If you are wrong God help you when there is a problem.
I hate testing cars!!!!!