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Sounds to me like you have air in the system still, a sticking caliper, or a brake hose that is bad.
Silly question, but does the car have drum or disc on the rear? You didn't specify, just stated that calipers and pads had been replaced.
If the rear is drum, the shoes being a bit out of adjustment will cause the pedal to feel spongy and low on the first try, but will pump up on the second hit.
A bad booster will have no effect on how far the pedal travels, only the effort needed to push the pedal down. The only way a booster can have any effect on pedal travel, is the plunger inside it that actually operates the master cyl. It could be out of adjustment, but that is something normally found only after a replacement booster has been installed.
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