hi sages - agree bad mc is most likely cause. one of the pistons on the single shaft is probably not holding pressure;fluid could be leaking out the back where the pedal push rod connects to the plunger or could be getting pushed back into the resevoir. either way mc stinko. if vacuum leak is in power brake cannister or in vacuum hose could cause hard pedal or could cause low pedal. saw this once in my 62 dodge wherein the problem persisted after i replaced the mc and bled it 20 times to no avail. thanks tons oldduke
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