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[Colinthemini]

Hi people i would like to introduce myself and say hello to you all i am 12 months int my restoration and about a.month off the finishing line i have put 1300 engine in it and done a floor restoration but i am having a problem with the in line servo wich i decided to put on as i have fitted twin discs it is a cooper s after market when i start the engine all the breaks lock on if i disconect the pipe from the inlet manifold to the servo they unlock has anyone had this problem im thinking it could be a diaphram fault and i am about to strip it down what do i need to look for