my breaks are lossing presure on first pump on 1999 Buick Century

my front break pads were replaced last fall and in the last month when i would prss the breake the break pedal would go almost to the floor but if i let my foot off the break and pump it agin the would stiffin up and work great

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1 answer
could be air in the system.
could be a wheel bearing failure in the front wheel as well.
could be a master cylinder seal failure.
at any rate, get it to a shop to have it pin pointed and a bid.

Roy