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another reason for low pedal is rotor run out---they knock the pistons back away from the discs and it then takes excessive pedal travel(master cylinder stroke) to just take up the slack!!!! with a single master cyl when the one end is pressurized you can't then push the pedal further to completely pressurize the other end.
Also the usage of a residual valve could help the situation---some OEM masters have these behind the fittings and some RACE types don't--
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