Pete,
I think that there is a pressure relief valve somewhere though how you'd test it I've no idea - assuming there is a way. My Mondeo got recalled for a replacement of exactly this item and I didn't notice any difference afterwards.
It might be worthwhile seeking out a brake specialist and asking a few questions.......
__________________
Gavin
VOC17969
2000 S40 1.8S -with various options (Now sold @135k miles)
2012 S40D3 R-Design
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