I got the AJPS brake adapters and assembled the kit with RX7 series 4/5 brakes etc... But I put it all on a friends car. I used my calculator and thought the stock MC would be the correct size, 13/16". But after a few days at the track my friend still says the brake pedal is way too soft.
From experience, what size master cylinder do we think is right for the Mazda 4-spot brakes? Assuming a totaly standard car has normal pedal firmness and travel.
And maybe running the standard MC with no booster is an option. (Is it legal for roadworthy inspections?)