Mike. From memory I don't think pedal travel was noticably short but the pedal effort required to stop was very noticable! I am thinking that the larger master cylinder diameter was fitted at POB because I have discs all round which theoretically may need more fluid displacement with eight large pistons? Can't do any practical checks at present as car on stands for smaller 24mm dia front ARB fitting (which has been on my 'to do' list for ages). Will do some measurements with and without engine vacuum when I can and let you know. Hopefully with a large master cyl bore I should get much improved braking with less tendency to lock the wheels. Peter.
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