Also a loose or failing wheel bearing can cause the same issue. Say the wheel bearing is bad enough to have the wheel "lean". that lean forces the caliper piston back in and you "pumping it up" is doing nothing more but straightning the wheel out to achieve a good pedal.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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