Mine were just shot...Biggest problem I saw was the rubber lines wre partially (to completely) blocked, theus not much fluid got to my leaky wheel cylinders.
Like the others said it is probably just old, corroded, funkied up. If you don't know the age...I'd say replace at least all the wheel cylinders/rubber hoses and what ever else looks worn. I have manual brakes and original master cylinder and mine stops real good (large 60 series tires help too). It will take more pressure by you (never drove one with power brakes in our years), but will give you more than enough stopping power.
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